the average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg . find the average weights of all the boys in the class .
"16 * 50.25 + 8 * 45.15 / 24 = 48.55 answer : c"
divide(add(multiply(16, 50.25), multiply(8, 45.15)), add(16, 8))