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11 replies to this topic

### #1 rohit_bd

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Posted 28 June 2009 - 06:40 PM

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

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### #2 Steeleman23

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Posted 28 June 2009 - 06:47 PM

Spoiler for

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### #3 rohit_bd

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Posted 28 June 2009 - 06:52 PM

too fast.

try for other possibilites
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### #4 superprismatic

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Posted 28 June 2009 - 07:38 PM

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### #5 LighthouseGal

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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.

Spoiler for simple math

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### #6 txmom2

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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.
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### #7 superprismatic

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Posted 28 June 2009 - 08:19 PM

Here's a more concrete solution based on my
previous post

Spoiler for a more concrete answer

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### #8 txmom2

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Posted 28 June 2009 - 08:57 PM

Here's a more concrete solution based on my
previous post

Spoiler for a more concrete answer

how is 29+28=56?
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### #9 superprismatic

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Posted 28 June 2009 - 09:02 PM

28 in base 11 is 2 times 11 plus 8;
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.
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### #10 VampireInuFreak

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Posted 29 June 2009 - 03:15 AM

Why are people thinking in multiple bases? It was merely a logic problem. Beefing it up by thinking in base 11 is just making a mountain out of a molehill. Really now.
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