in an examination , 40 % of total students failed in hindi , 40 % failed in english and 15 % in both . the percentage of these who passed in both the subjects is :
"pass percentage = 100 - ( 40 + 45 - 15 ) = 100 - 70 = 30 answer : c"
subtract(const_100, subtract(add(40, 40), 15))