50 boys and 100 girls are examined in a test ; 50 % of the boys and 40 % of the girls pass . the percentage of the total who failed is ?
"total number of students = 50 + 100 = 150 number of students passed = ( 50 % of 50 + 40 % of 100 ) = 25 + 40 = 65 number of failures = 85 * 100 / 150 = 56.7 % answer is c"
multiply(const_100, divide(subtract(add(50, 100), add(multiply(50, divide(50, const_100)), multiply(100, divide(40, const_100)))), add(50, 100)))