Problem: the average of 9 numbers is 23 . if each number is increased by 4 , what will the new average be ?
Rationale: "sum of the 9 numbers = 207 if each number is increased by 4 , the total increase = 4 * 9 = 36 the new sum = 207 + 36 = 243 the new average = 243 / 9 = 27 . answer : c"
annotated_formula: multiply(23, 4)