The Riddle Thread….
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November 27, 2008 6:21 pm at 6:21 pm #1067884jewishfeminist02Member
10=2[0]+0+9
9=(2x0x0)+9
7= 2.00+9
(Sorry, I don’t know how to type an exponent. The 10 equation is supposed to start with 2 to the 0 power.)
November 27, 2008 7:37 pm at 7:37 pm #1067885I can only tryMemberjewishfeminist02
So far you’re doing well – keep going.
The carat character (^) is Shift+6 on most fonts. Alternately you can use the character map utility (on a windows pc).
(please take a few moments to say some tehilim for those in Mumbai)
November 27, 2008 8:08 pm at 8:08 pm #1067886NobodyMemberICanOnlyTry and Jfem you are out of my league – I hate maths.
Here’s a nice and easy one
My life can be measured in hours,
I serve by being devoured,
Thin, I am quick,
Fat, I am slow,
Wind is my foe.
What am I?
November 27, 2008 8:23 pm at 8:23 pm #1067887Will HillParticipantHere’s a toughie:
How many female names (in Loshon Kodesh/Hebrew) can you name, that has a gematria of 646?
(Sorry, no hints till theres an answer!)
November 27, 2008 9:05 pm at 9:05 pm #1067888jewishfeminist02MemberNobody, I too hate math just thought I would try my hand at this one, since unlike traditional math problems, there seem to be multiple correct answers.
As for your riddle…is it a candle?
ICOT, it took me a while to come up with those three…let’s see what else I can think of. I’m certain I’m forgetting some math function or expression that would help (haven’t taken secular classes in nine months, so I guess I’m a little rusty.) Okay, I got one:
6=(2+0+0)Sq9 [How do you type a square root???]
So that still leaves 1,2,3,4, and 8, since you provided 5. I’ll keep thinking.
November 27, 2008 9:42 pm at 9:42 pm #1067889000646Participantwill hill,
I AM A GUY! i stink at math though so i have no idea
November 28, 2008 2:41 am at 2:41 am #1067891anon for thisParticipantICOT,
Thanks for clarifying that for Dr. Pepper. I’ve made it clear in other threads that I’m female, so I figured he knew.
November 28, 2008 3:44 am at 3:44 am #1067892Dr. PepperParticipantI apologize if I offended anyone, with out even thinking I put a title of Reb out of respect for my fellow Yidden, but I’ll stop.
“I can only try”
In the future feel free to ask any math questions, and please don’t think you are taking advantage I’m here to help.
Here’s how the rule works, (if you know of anyway that I can attach a PDF file to a post or somehow upload a file somewhere that I can link here please let me know. This is hard to follow without mathematical formatting).
2x + y + z = 3
x + 2y + z = 0
Given the general form of a system of three linear equations with three unknown variables:
ax + by +cz = j,
da + ey + fz = k,
ga + hy + iz = l
put this in matrix form:
a b c
d e f
g h i
(3 x 3 matrix)
multiplied by
x
y
z
(3 x 1 matrix)
equals
j
k
l
(3 x 1 matrix)
x =
the determinant of:
j b c
k e f
l h i
divided by
the determinant of:
a b c
d e f
g h i
(The determinant of a 3 x 3 matrix
a b c
d e f
g h i
For our example:
a = 2, b = 1, c = 1, j = 3
d = 1, e = 1, f = 1, k = 0
g = 1, h = 2, i = 1, l = 0
therefore the determinant of
j b c
k e f
l h i
is the determinant of
3 1 1
0 1 1
0 2 1
= 3
the determinant of
a b c
d e f
g h i
is the determinant of
2 1 1
1 1 1
1 2 1
= 2 1 + 2 +1 +4 1
= 3
therefore x = 3/3 = 1.
Similarly
y =
the determinant of:
a j c
d k f
g l i
divided by
the determinant of:
a b c
d e f
g h i
and
z =
the determinant of:
a b j
d e k
g h l
divided by
the determinant of:
a b c
d e f
g h i
The final results are x = 1, y = 2 and z = 3.
I hope this helps.
November 28, 2008 5:11 am at 5:11 am #1067893anon for thisParticipantDr. Pepper,
I wasn’t in the least offended, and I see no need to stop addressing people that way. I think ICOT mentioned it because some posters prefer to know the gender of the person they’re addressing.
November 28, 2008 5:17 am at 5:17 am #1067894Will HillParticipantCorrection, Gentleman:
The correct riddle is thus;
How many male names (in Loshon Kodesh/Hebrew) can you name, that has a gematria of 646?
Hint: The name might contain 6 characters.
November 28, 2008 5:44 am at 5:44 am #1067895Bais Yaakov maydelParticipantwill hill: how about some specific parshios? or at least chumashim.
or any part of tanach
November 28, 2008 8:55 am at 8:55 am #1067896NobodyMemberJfem02 Gold Star to you! Yey!!!
Dr Pepper – you are kidding aren’t you? Are we supposed to follow this?
November 28, 2008 9:28 am at 9:28 am #1067897jewishfeminist02MemberOkay, I have an alternative solution for 9. I racked my brains and remembered eighthgrade algebra good old FOIL! Too bad it doesn’t give me a new answer.
9=(20)(0+9)
November 28, 2008 12:43 pm at 12:43 pm #1067898Dr. PepperParticipantI probably should have defined some terms.
A matrix is a rectangular array (m by n) of numbers. It can be a single number (a 1 by 1 matrix) or any other dimension (m and n must be positive integers). A matrix is denoted by brackets on both sides.
A determinant is a value only given to a square matrix (where m = n). For a 1 by 1 matrix the determinant is the lone entry. For a 2 by 2 matrix
a b
c d
the determinant is (a)*(d)(c)*(b).
The formula for a 3 by 3 matrix was mentioned above in my previous post.
Please don’t ask me to post the formulas for anything greater than m = n = 3, they are very long.
The determinant of a matrix is denoted by vertical bars on both sides. For example if we have a matrix named “A” then the determinant of “A” is denoted by A. There are also text books that put the vertical bars on both sides of the whole array to denote the determinant.
November 30, 2008 3:10 am at 3:10 am #1067899Dr. PepperParticipantI can only try
0 = 2*0*0*9
1 = 2^0+0*9
2 = 2+0*0*9
3 = 2*0*0+?9
4 = 2^0+0+?9
5 = 2+0+0+?9
6 = (2+0+0)*?9
7 = 2+0+0+9
8 = (2^0)+0+9
9 = 2*0*0+9
10 = 2^0+0+9
November 30, 2008 3:17 am at 3:17 am #1067900Dr. PepperParticipantNobody
If there’s something you don’t understand please ask. I’m here to help. I understand that it may be hard to follow because of the formatting but I wouldn’t consider this example challenging.
November 30, 2008 3:29 pm at 3:29 pm #1067901I can only tryMemberHappy New Year:
jewishfeminist02
not bad at all
Dr. Pepper
Correct!
November 30, 2008 3:30 pm at 3:30 pm #1067902I can only tryMemberTime and Again solution:
1) 5 (that I came up with)
3)
November 30, 2008 3:52 pm at 3:52 pm #1067903I can only tryMemberWater, Water Everywhere
Yankel, a U.S. Army Corps of Engineers employee, was assigned the task of reconstructing the New Orleans levees.
On what Hebrew calendar date(s) should Yankel take his measurements?
Why?
November 30, 2008 9:06 pm at 9:06 pm #1067904Will HillParticipantBoy’s name with a gematria of 646? ______
December 1, 2008 12:16 am at 12:16 am #1067905000646ParticipantWill Hill,
whats with you and the personel questions?
and can you answer the question i asked you in both the thred about girls learning and the random questions thread?
December 1, 2008 1:43 am at 1:43 am #1067906Will HillParticipantRiddle: A maskil that starts with a “triple0”: ______
December 1, 2008 3:11 am at 3:11 am #1067907Bais Yaakov maydelParticipantwill hill: from tanach, or in general??
cuz here i am, killing myself thru every parsha lol
December 1, 2008 3:40 am at 3:40 am #1067908Will HillParticipantBym, in general (though maybe Tanach, but not necessarily.)
Few hints:
Maybe 6 letters.
Kuf = 100
Resih = 200
Shin/Sin = 300
Tuf = 400
So there is only a few ways to get to 600 something. (e.g. Shin & Shin…, Tuf & Kuf…, etc.)
December 1, 2008 4:32 am at 4:32 am #1067909Will HillParticipantlast example should’ve read tuf and reish. (these are just possibilities thrown out…)
December 3, 2008 1:28 am at 1:28 am #1067910I can only tryMemberWater, Water Everywhere: Answer
At the very beginning/end and in the very middle of the Hebrew month, right at chatzos (either day or night).
These are the times that the sun, earth, and moon most closely line up in a straight line, so the gravitational pulls of the sun and the moon work together to cause high tide.
December 5, 2008 4:47 am at 4:47 am #1067911havesomeseichelMemberThat is so neat ICOT… never thought about that.. would the season make any difference? (except not during the late summers when there are hurricanes… kind of hard to do…) this riddle page is neat for finding odd facts!
December 5, 2008 12:40 pm at 12:40 pm #1067912I can only tryMemberHavesomeseiche
There are other factors as well, such as planetary alignment, but the effect of other planets on our tides is very minor.
December 5, 2008 12:41 pm at 12:41 pm #1067913I can only tryMember(from an IQ test)
15, 8, 12, 80
18, 7, 6, 147
19, 6, 12, ?
December 5, 2008 12:41 pm at 12:41 pm #1067914I can only tryMemberAn Easy One (for political junkies)
According to a Gallup poll, the U.S. president was the mostadmired man in America in each of the following years, except one.
Which one?
Why?
a) 1986
b) 1979
c) 1974
d) 1970
e) 1966
December 7, 2008 8:41 am at 8:41 am #1067915brooklyn19ParticipantICOT
Even though LBJ was really unpopular, I’m guessing 1974 – the year of Nixon’s whole scandal. (that WAS 1974, right?!?)
December 7, 2008 3:26 pm at 3:26 pm #1067916I can only tryMemberbrooklyn19
Correct!
December 7, 2008 4:50 pm at 4:50 pm #1067917brooklyn19Participantyeah well i’m not such a math person but history?!?! bring it on!
December 8, 2008 1:13 pm at 1:13 pm #1067918TruehonestyMemberEach man actually paid $9 (after receiving $1 change) so altogether that makes $27 plus the $2 that the waiter kept makes $29. What happened to the last $1?
December 8, 2008 5:33 pm at 5:33 pm #1067920December 8, 2008 6:01 pm at 6:01 pm #1067921squeakParticipantYou are in a house with an allsouthern view. Suddenly, a bear walks by. What color was the bear?
December 8, 2008 6:03 pm at 6:03 pm #1067922squeakParticipantI posted the same riddle as above to a different audience a few years ago. It met with much lively discussion:
A bear drops into a hole in the ground from v=0 meters per second at time t = 0. Two seconds later it landed on the bottom. If the hole is 20 meters deep and we assume no air resistance, what color was the bear?
December 9, 2008 12:57 am at 12:57 am #1067923I can only tryMember15, 8, 12, 80 ==> 15 x 2 x 8^2 / (12 x 2) = 80
18, 7, 6, 147 ==> 18 x 2 x 7^2 / (6 x 2) = 147
19, 6, 12, ? ==> 19 x 2 x 6^2 / (12 x 2) = 57
December 9, 2008 1:35 am at 1:35 am #1067924I can only tryMemberSqueak
By the time the falling bear hits the bottom of a 60meter pit, it will be traveling at about 4344 mph.
At that speed, whether it was originally black or white, it is probably now red all over.
December 9, 2008 2:43 am at 2:43 am #1067925Dr. PepperParticipantI can only try
Why the extra steps?
This is how I would do it:
15, 8, 12, 80 ==> 15 x 8^2 / 12 = 80
18, 7, 6, 147 ==> 18 x 7^2 / 6 = 147
19, 6, 12, ? ==> 19 x 6^2 / 12 = 57
December 9, 2008 2:46 am at 2:46 am #1067926I can only tryMemberSqueak
December 9, 2008 2:48 am at 2:48 am #1067927Dr. PepperParticipantHere’s an old one:
In the following equation, what Yom Tov does x equal to: 10^x = baomer?
(It was taken from the secular riddle 10^x = cabin.)
December 9, 2008 2:54 am at 2:54 am #1067928I can only tryMemberDr. Pepper
I held off on posting the solution, because I was sure you’d get it and were just waiting in order to give others a chance.
You are correct, of course, but I wanted to associate a “2” with each number (except the result).
To you, was this “two” puzzle too easy? Et, tu?
December 9, 2008 2:56 am at 2:56 am #1067929I can only tryMemberDr. Pepper
Cute – it’s been a long time since 10th grade geometry ðŸ˜‰
December 9, 2008 3:07 am at 3:07 am #1067930Dr. PepperParticipantI can only try
I actually thought I got it after the first line but I was wrong.
I did 1 x 5 x 8 x 1 x 2 = 80.
But no!
Next I found the prime factorizations and got almost nowhere on the first line (except that I found many instances of the number 2) but on the second line there was one 7 on the left side and two on the right so I knew that one of the terms was squared.
The rest was smooth sailing.
December 9, 2008 12:59 pm at 12:59 pm #1067931JosephParticipantOne day, a person went to horse racing area, Instead of counting the number of human and horses, he instead counted 74 heads and 196 legs. Yet he knew the number of humans and horses there. How did he do it, and how many humans and horses are there?
December 9, 2008 1:00 pm at 1:00 pm #1067932JosephParticipantWhat place in this world can have their temperatures Fahrenheit and Celsius equal?
December 9, 2008 2:30 pm at 2:30 pm #1067933Dr. PepperParticipantJoseph,
Let X = humans and Y = Horses
X + Y = 74
2 * X + 4 * Y = 196 => X + 2 * Y = 98 (divide both sides by 2)
(X + 2 * Y = 98)
(X + Y = 74)
=> Y = 24 => X = 50
50 Humans and 24 Horses.
December 9, 2008 2:33 pm at 2:33 pm #1067934Dr. PepperParticipantJoseph,
40 degrees Celsius = 40 degrees Fahrenheit
I think the North Pole would be one place.
December 9, 2008 2:46 pm at 2:46 pm #1067935anon for thisParticipantThis isn’t a riddle but a neat math trick my daughter figured out several years ago. If you take 2 numbers, x and x+2, their product will be one less than the square of their average. For example, 6×8=48, which is 1 less than the square of 7, or 49. This makes it easy to figure out a product like 19×21, since it’s just 20^21, or 4001=399. If all of you already knew this, I apologize, but I thought it was neat (you can use polynomials to prove why this works).
A variation on this makes it easier to figure out the square of a number like 4.5. The answer is (4×5)+.25 or 20.25.
If anyone is interested I can post the proof. Or I can just leave it as an exercise for the reader (I always felt like this was a copout when I saw it in a textbook but it’s fun to write).

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