the average of 60 results is 40 and the average of other 40 results is 60 . what is the average of all the results ?
"answer sum of 100 result = sum of 60 result + sum of 40 result . = 60 x 40 + 40 x 60 = 4800 / 100 correct option : c"
divide(add(multiply(60, 40), multiply(40, 60)), add(60, 40))