1100 boys and 700 girls are examined in a test ; 42 % of the boys and 30 % of the girls pass . the percentage of the total who failed is ?
total number of students = 1100 + 700 = 1800 number of students passed = ( 42 % of 1100 + 30 % of 700 ) = 462 + 210 = 672 number of failures = 1128 * 100 / 1800 = 190 / 3 % = 63.3 % answer is a
multiply(const_100, divide(subtract(add(1100, 700), add(multiply(1100, divide(42, const_100)), multiply(700, divide(30, const_100)))), add(1100, 700)))