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by Brian Gladman on April 4, 2016

Sunday Times Teaser 2793 – Sum Triangles

by Victor Bryant

In this picture:

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there are ten upward-pointing triangles of all sizes.

In a similar picture with many more rows, the total number of upward-pointing triangles is divisible by all the digits from 1 to 9.

In this larger picture the number of upward-pointing triangles in the bottom row is equal to Trix’s age.

How old is Trix?

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