Mike scores average of 21 in 7 math tests. His average in the first 3 tests is 19. What is his average in the last 4 tests?
(A) 22
(B) 22.5
(C) 23
(D) 23.5
(E) None of the above
It is given to us that average is 21 in 7 math tests.
(1)
It is also given to us that average in the first 3 tests is 19.
(2)
Putting (2) in (1), we get
Hence, the answer is (B).
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