The average of 6 quantities is 8. The average of 4 of them is 5. What is the avg. of the remaining 2 numbers? Choose the correct answer
A) 11	B) 12	C) 13	D) 14	E) 15

Rationale: "sum of 8 quantities = total no of quantities x average of them = 6 x 8 = 48 sum of 4 quantities = 4 x 5 = 20 sum of 4 quantities + sum of 2 quantities = sum of 6 quantities 20 + sum of 2 quantities = 48 sum of 2 quantities = 28 average of 2 quantities = sum of 2 quantities / 2 = 28 / 2 = 14 answer : d"
Answer: D