the average of 11 numbers is 500 . out of 11 numbers the average of first 6 no . is 50 , and last 6 numbers is 60 then find 6 th number ?
"6 th number = sum of 1 st 6 no . s + sum of last 6 no . s - sum of 11 no . s answer = 6 * 50 + 6 * 60 - 11 * 50 = 110 answer is c"
subtract(add(multiply(6, 50), multiply(6, 60)), multiply(11, 500))