The apples in both baskets (a) and (b) are 72 kilograms (kg). If (a) the apples in the basket weigh 42 kilograms (kg), how many kilograms (kg) are the apples in (b) lighter than the apples in the basket (a)?
42 72 42 [OP_SUB] [OP_SUB]
var_a = 42
var_b = 72
var_c = 42
var_d = var_b - var_c
var_e = var_a - var_d
print(int(var_e))