Respuesta :

You don't have to look very far in either case. Both answers are "a".

1. Checking selection "a",
  265 =? 35 +20*7 = 35 +140 = 175
  a (7, 265) is NOT a solution

2. Checking selection "a",
  18 =? 5*4 -2 = 20 -2 = 18
  a (4, 18) IS a solution