Question

57 □ 83 = 87, 23 □ 12 = 38.12 □ 14 = 18.16 □ 17 =?

Answer 1

Answer:

87 + 92 = 18; ie; ((8+7)+(9-2)-4) = 18

57 + 83 =13; ie; ((5+7)+(8-3)-4) = 13

12 + 61 = 4; ie; ((1+2)+(6-1)-4) = 4

therefore

62 + 13 = ((6+2)+(1–3)-4) = 2

:)