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### #1

Posted 28 June 2009 - 06:40 PM

### #2

Posted 28 June 2009 - 06:47 PM

### #3

Posted 28 June 2009 - 06:52 PM

try for other possibilites

### #4

Posted 28 June 2009 - 07:38 PM

### #5

Posted 28 June 2009 - 07:51 PM

Each number in the pyramid is the sum of the two numbers immediately below it. Fill in the pyramid with the missing numbers.

### #6

Posted 28 June 2009 - 07:56 PM

Spoiler for simple math

you know steeleman23 already guessed that and that what I got too, but rohit said it was wrong.

### #7

Posted 28 June 2009 - 08:19 PM

previous post

### #8

Posted 28 June 2009 - 08:57 PM

Here's a more concrete solution based on my

previous postSpoiler for a more concrete answer

how is 29+28=56?

### #9

Posted 28 June 2009 - 09:02 PM

29 in base 11 is 2 times 11 plus 9;

Adding these, we get 4 times 11 plus 17

which is 5 times 11 plus 6 -- that's

56 in base 11.

### #10

Posted 29 June 2009 - 03:15 AM

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