The average runs scored by a batsman in 20 matches is 30. In the next 10 matches the batsman scored an average of 15 runs. Find his average in all the 30 matches?  Choose the correct answer
A) 25  B) 46  C) 88  D) 13  E) 12

Rationale: "total score of the batsman in 20 matches = 600 . total score of the batsman in the next 10 matches = 150 . total score of the batsman in the 30 matches = 750 . average score of the batsman = 750 / 30 = 25 . answer : a"
Answer: A