1) 9 + 2 = B, not 11 or A 2) A + B = 15 (16 + 5 = 21) 3) AF + 13 = C2 (175+19=192+2) 4) 11 - F = 2 (17-15=2) 5) AF - AA = 5 (175-170=5) 6) 72 - 36 = 3C (114-54=48+12)
