If 1.5 x a = 0.04 x b then the value of (b - a) / ( b + a) is?

a / b = 0.04 / 1.5
= 4 / 150
= 2 / 75
∴ Given Exp. (b - a) / ( b + a)
= (1- a/b ) / (1 + a/b)
= (1- 2 / 75) / (1 + 2 / 75)
= ( 73/75 ) / ( 77/75)
= 73/77