the average age of 15 students of a class is 15 years . out of these , the average age of 6 students is 14 years and that of the other 9 students is 16 years , the age of the 15 th student is
"explanation : age of the 15 th student = [ 15 * 15 - ( 14 * 6 + 16 * 8 ) ] = 13 years . answer : c"
subtract(multiply(15, 15), add(multiply(6, 14), multiply(9, 16)))