Question

Here are six number cards -7, -5, -3,3,1,-1 arrange these cards into three pairs with the same total

Answer 1

The sum of all of the cards is -7 + (-5) + (-3) + 3 + 1 + (-1) = -12 which means that each pair must have a sum of -12 / 3 = -4. This means that the pairs are -7 and 3, -5 and 1, and -3 and -1.