 Home Forums Decaffeinated Coffee The Riddle Thread….

Viewing 50 posts - 251 through 300 (of 2,251 total)
• Author
Posts
• #1067884

10=2+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.)

#1067885

jewishfeminist02-

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)

#1067886
Nobody
Member

ICanOnlyTry 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?

#1067887
Will Hill
Participant

Here’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!)

#1067888

Nobody, 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.

#1067889
000646
Participant

will hill,

I AM A GUY! i stink at math though so i have no idea

#1067891
anon for this
Participant

ICOT,

Thanks for clarifying that for Dr. Pepper. I’ve made it clear in other threads that I’m female, so I figured he knew.

#1067892
Dr. Pepper
Participant

I 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.

#1067893
anon for this
Participant

Dr. 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.

#1067894
Will Hill
Participant

Correction, 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.

#1067895
Bais Yaakov maydel
Participant

will hill: how about some specific parshios? or at least chumashim.

or any part of tanach

#1067896
Nobody
Member

Jfem02 Gold Star to you! Yey!!!

Dr Pepper – you are kidding aren’t you? Are we supposed to follow this?

#1067897

Okay, I have an alternative solution for 9. I racked my brains and remembered eighth-grade algebra- good old FOIL! Too bad it doesn’t give me a new answer.

9=(2-0)(0+9)

#1067898
Dr. Pepper
Participant

I 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.

#1067899
Dr. Pepper
Participant

I 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

#1067900
Dr. Pepper
Participant

Nobody

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.

#1067901

Happy New Year:

jewishfeminist02-

Dr. Pepper-

Correct!

#1067902

Time and Again solution:

1) 5 (that I came up with)

3)

#1067903

Water, 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?

#1067904
Will Hill
Participant

Boy’s name with a gematria of 646? ______

#1067905
000646
Participant

Will Hill,

whats with you and the personel questions?

#1067906
Will Hill
Participant

Riddle: A maskil that starts with a “triple-0”: ______

#1067907
Bais Yaakov maydel
Participant

will hill: from tanach, or in general??

cuz here i am, killing myself thru every parsha lol

#1067908
Will Hill
Participant

Bym, 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.)

#1067909
Will Hill
Participant

last example should’ve read tuf and reish. (these are just possibilities thrown out…)

#1067910

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.

#1067911

That 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!

#1067912

Havesomeseiche-

There are other factors as well, such as planetary alignment, but the effect of other planets on our tides is very minor.

#1067913

(from an IQ test)

15, 8, 12, 80

18, 7, 6, 147

19, 6, 12, ?

#1067914

An Easy One (for political junkies)

According to a Gallup poll, the U.S. president was the most-admired man in America in each of the following years, except one.

Which one?

Why?

a) 1986

b) 1979

c) 1974

d) 1970

e) 1966

#1067915
brooklyn19
Participant

ICOT

Even though LBJ was really unpopular, I’m guessing 1974 – the year of Nixon’s whole scandal. (that WAS 1974, right?!?)

#1067916

brooklyn19-

Correct!

#1067917
brooklyn19
Participant

yeah well i’m not such a math person but history?!?! bring it on!

#1067918
Truehonesty
Member

Each 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?

#1067920
#1067921
squeak
Participant

You are in a house with an all-southern view. Suddenly, a bear walks by. What color was the bear?

#1067922
squeak
Participant

I 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?

#1067923

15, 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

#1067924

Squeak-

By the time the falling bear hits the bottom of a 60-meter pit, it will be traveling at about 43-44 mph.

At that speed, whether it was originally black or white, it is probably now red all over.

#1067925
Dr. Pepper
Participant

I 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

#1067926

Squeak-

#1067927
Dr. Pepper
Participant

Here’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.)

#1067928

Dr. 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).

#1067929

Dr. Pepper-

Cute – it’s been a long time since 10th grade geometry 😉

#1067930
Dr. Pepper
Participant

I 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.

#1067931
Joseph
Participant

One 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?

#1067932
Joseph
Participant

What place in this world can have their temperatures Fahrenheit and Celsius equal?

#1067933
Dr. Pepper
Participant

Joseph,

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.

#1067934
Dr. Pepper
Participant

Joseph,

-40 degrees Celsius = -40 degrees Fahrenheit

I think the North Pole would be one place.

#1067935
anon for this
Participant

This 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 20^2-1, or 400-1=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).

Viewing 50 posts - 251 through 300 (of 2,251 total)
• You must be logged in to reply to this topic.