The average of 5 quantities is 12. The average of 3 of them is 4. What is the average of remaining 2 numbers?
Choose the correct option.
A) 24 B) 10 C) 8 D) 9.5 E) none of these

Rationale: "answer : a ( 5 x 12 - 3 x 4 ) / 2 = 24"
Answer: A