Question

([37-42:(45:3-63:7)]:6×128}:8:2=40

Answer 1

{[37-42:(45:3-63:7)]:6×128}:8:2=40
{[37-42:(15-9)]:6×128}:8:2=40
[(37-42:6):6×128]:8:2=40
[(37-7):6×128]:8:2÷40
(30:6×128):8:2=40
(5×128):8:2=40
640:8:2=40
80:2=40
40=40 (A)