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1. X's marks are 70, 90, 65, 85 and 75. What marks he must get on the next test to raise her average to 80 ?
- A. 80
- B. 80
- C. 80
- D. 80
Answer: Option D
Explanation:
Total marks in 6 test = (6*80) = 480
Total marks in 5 test = (70 + 65 + 90 + 75 + 85) = 385
So, marks in the 6th test = (480 - 385) = 95
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