Problem: the average age of 18 students of a class is 18 years . out of these , the average age of 5 students is 14 years and that of the other 9 students is 16 years , the age of the 18 th student is
Rationale: "explanation : age of the 18 th student = [ 18 * 18 - ( 14 * 5 + 16 * 9 ) ] = ( 324 - 214 ) = 110 years . answer : c"
annotated_formula: subtract(multiply(18, 18), add(multiply(5, 14), multiply(9, 16)))