Question

Write a number 1,3,5,7,9,11,13,15,17 in each circle so that the sum of the numbers in each side of the triangle is exactly 30. each number can be used only once.

Answer 1

15 + 5 + 9 + 1 + (log1) = 30. ... It is impossible to get an even number by adding 5 odd numbers. .... All the given numbers (1,3,5,7,9, 11,13) have to be used once and ONLY once  ...