The average of 10 numbers is P and the average of 4 of these numbers is Q. If the average of remaining numbers is R then which of the following is correct:
Answer & explanation
Correct answer: option 3
Sum of age of 10 numbers = 10P
Sum of age of 4 numbers = 4Q
Now , Sum of age of remaining 6 is = 6R
So , 10P = 4Q + 6R
5P = 2Q + 3R , is correct answer .