View Full Version : Brainteaser
Make [] + [] + [] = 30 by filling in the three boxes with numbers from the set
(1, 3, 5, 7, 9, 11, 13, 15)
You may use any of these numbers more than once. You must place one number in each of the three boxes.
Fuzzy12 061815, 06:49 PM 5+7+9=30 :)
Fuzzy12 061815, 06:54 PM Cmon abi..the curiosity is killing me... :eek:
Fuzzy12 061815, 06:56 PM Do the numbers have to go inside the box? Otherwise how about 1[]+1[]+1[]=30
???
The numbers have to go inside the box. 1 number per box.
Hint: try a few random combinations of the numbers given and observe the type of answers you get closely.
Greyhound1 061815, 07:09 PM Can they be negative numbers? When you say they can be used more than once, can they be used more than once and added together and put into one box? Can they be squared basically for one box?
Hound: None of the above is allowed.
Greyhound1 061815, 07:11 PM Hint: try a few random combinations of the numbers given and observe the type of answers you get closely.
They are always going to be odd numbers
Fuzzy12 061815, 07:14 PM Hint: try a few random combinations of the numbers given and observe the type of answers you get closely.
Hm.. How is it possible to get an even number with 3odd numbers? Is this a trick question? If not, do I need to know anything that wasn't taught in primary school?
Lunacie 061815, 07:16 PM Three odd numbers added together will always result in an odd number.
30 is an even number, so I don't think it's possible.:umm1:
It is a trick question.
You don't need anything beyond elementary arithmetic.
Luna is correct :) (tho Hound did a bunch of the heavy lifting)
The sum of 3 odd numbers will always be odd. I'll spare you guys the torture of seeing it proved, tho it's quite short and easy to do.
Greyhound1 061815, 07:19 PM And therefore? :)
It's futile?
Fuzzy12 061815, 07:20 PM So is the answer that it's not possible? Is there a trick answer or is the trick that you just wasted precious moments of my life trying to figure out possible trick answers? :lol:
dvdnvwls 061815, 07:21 PM 11+13+6=30
I took the liberty of turning the 9 upside down before using it. :)
Fuzzy12 061815, 07:22 PM Yup, precious moments it is.. :mad::doh::doh::doh:
dvdnvwls 061815, 08:15 PM What if it's not base 10?
Nice twist.
Let's try it.
11 + 13 + 7 works in base 11 :)
Sorry, I shouldn't call it base 11. Base B where B represents the number "eleven"
A more elegant one: 1 + 11 + 11 in base 3
Edit: this is wrong, sorry.
dvdnvwls 061815, 08:48 PM So, are you saying that the conventionally correct answer is the same as what the mathematician remarked on seeing a huge new statue of the number 3 on the sidewalk? :)
psychopathetic 061815, 11:29 PM Hey DVD! It's nice to see ya man! :)
psychopathetic 061815, 11:33 PM I cheated and google searched this. Would take a ******* genius to figure this one out with no hints.
Me? I don't even know wtf bases are in math! :lol:
What if it's not base 10?
Very freaking clever DVD!
dvdnvwls 061915, 03:18 AM So, are you saying that the conventionally correct answer is the same as what the mathematician remarked on seeing a huge new statue of the number 3 on the sidewalk? :)
Huh??:):)
He said "That's odd..." :)
*checks what this thread is about and runs away*
BellaVita 061915, 03:50 AM *checks what this thread is about and runs away*
I hear ya, stef.
dvdnvwls 061915, 04:09 AM Me? I don't even know wtf bases are in math! :lol:
All your base are belong to us. :)
With normal numbers (called base 10), the columns multiply by 10. The normal number 101 means a one, no tens, and a hundred. With base 2, the columns multiply by 2. The base 2 number 101 means a one, no twos, and a four.
You can have base anythingyoulike. When using bases of more than 10, there aren't enough digits to count as high as needed, so the digits are usually supplemented with letters. Each column in base sixteen is usually written with 1,2,3,4,5,6,7,8,9,A,B,C,D,E,F, where FB2 would mean 2 ones, eleven sixteens, and fifteen twohundredfiftysixes.
The usual reason for using any of these other bases is that you're using a piece of equipment or doing a project where counting things in tens is unnatural or not helpful.
Pilgrim 061915, 07:47 AM What is this?
Little Missy 061915, 08:21 AM What is this?
An offshoot of word problems. The bane of my elementary school existence.:scratch:
Pilgrim 061915, 08:49 AM An offshoot of word problems. The bane of my elementary school existence.:scratch:
Right.
midnightstar 061915, 05:15 PM Make [] + [] + [] = 30 by filling in the three boxes with numbers from the set
(1, 3, 5, 7, 9, 11, 13, 15)
You may use any of these numbers more than once. You must place one number in each of the three boxes.
15 + 13 + 3  1 = 30
(I think) :lol:
*brain explodes*
Too many numbers :doh:
Lunacie 061915, 05:59 PM 15 + 13 + 3  1 = 30
(I think) :lol:
*brain explodes*
Too many numbers :doh:
... tidies up the brain debris ...
http://images.clipartof.com/small/1140381CartoonOfAHappyBlondGirlSweepingRoyaltyFreeVectorClipart.jpg
psychopathetic 061915, 09:28 PM All your base are belong to us. :)
With normal numbers (called base 10), the columns multiply by 10. The normal number 101 means a one, no tens, and a hundred. With base 2, the columns multiply by 2. The base 2 number 101 means a one, no twos, and a four.
You can have base anythingyoulike. When using bases of more than 10, there aren't enough digits to count as high as needed, so the digits are usually supplemented with letters. Each column in base sixteen is usually written with 1,2,3,4,5,6,7,8,9,A,B,C,D,E,F, where FB2 would mean 2 ones, eleven sixteens, and fifteen twohundredfiftysixes.
The usual reason for using any of these other bases is that you're using a piece of equipment or doing a project where counting things in tens is unnatural or not helpful.
Ummmmm
B?
Yes. Yes that's my final answer! I think.
?
...WAIT!
No!
LEFT!
Left is the correct answer?
:(
I want my mommy!

