the average of 11 results is 60 . if the average of first 6 results is 58 and that of the last 6 is 63 , find the sixth result ?
sixth result = 58 * 6 + 63 * 6 - 60 * 11 = 66 answer is e
subtract(add(multiply(6, 58), multiply(6, 63)), multiply(11, 60))