Question

The left and right page numbers of an open book are two consecutive integers whose sum is 331 Find these page numbers.

Answer 1

165 and 166

Explanation:

You can divide 331 by 2 to get 165.5. You then round down for one answer, 165, and round up for the other, 166. This evens out the rounding, and to check your answer you can add 165 and 166, which is 331.