the average of 10 numbers was calculated as 18 . it is discovered later on that while calculating the average , one number , namely 66 , was incorrectly read as 26 . what is the correct average ?
"10 * 18 - 26 + 66 = 220 220 / 10 = 22 the answer is c ."
divide(add(multiply(10, 18), subtract(66, 26)), 10)