Trollathon 4-6
Level
pending
10 triangles + 10 squares = ?
Hint : NOHTALLORT??
The answer is 155.
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1 solution
NOHTALLORT is actually TROLLATHON written in reverse. So, we might want to read the problem as ? = Squares 10 + Triangles 10. The 10th square number is 1 0 0 and the 10th triangular number is 5 5 . So, 1 0 0 + 5 5 = 1 5 5 .