Tough and Tricky questions: Number Properties.
On his first 3 tests, Rajeev received an average score of N points. If on his fourth test, he exceeds his previous average score by 20 points, what is his average score for his first 4 tests?
A) N
B) N + 4
C) N + 5
D) N + 10
E) N + 20
Kudos for a correct solution.