The average of four test marks was 60 . The first three marks were 30,55 and 65 . What was the fourth mark?
(A) 40
(B) 55
(C) 60
(D) 70
(E) 90
The average of four test marks was 60 . The first three marks were 30,55 and 65 . What was the fourth mark?
(A) 40
(B) 55
(C) 60
(D) 70
(E) 90

## Solution

The total number of marks scored on the four tests was $4 \times 60$ or 240 . The total number of marks scored on the first three tests was 150. The fourth mark was $240-150=90$. ANSWER: (E)