the average of 45 results is 25 and the average of other 25 results is 45 . what is the average of all the results ?
"answer sum of 70 result = sum of 45 result + sum of 25 result . = 45 x 25 + 25 x 45 = 2250 / 70 correct option : b"
divide(add(multiply(45, 25), multiply(25, 45)), add(45, 25))