A student of physics obtains the average of 60 in his 4 physics tests. How many marks in his fifth test will bring the any to 65?
- 80
- 90
- 85
- None of these
Explanation
Current total marks = Average * Number of tests
= 60 * 4
= 240
New average = 65
New total tests = 5
New total marks = New average * New total tests
= 65 * 5
= 325
Marks needed in the fifth test = New total marks - Current total marks
= 325 - 240
= 85
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