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Question

In a test containing of 80 questions carrying one mark each, Arpita answered 65 % of the first 40 questions correctly. What percent of the other 40 questions does she need to answer correctly for her grade in the entire exam to be 75 %?

A
60
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B
80
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C
85
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D
75
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Solution

The correct option is C 85
Let the required per cent of question be x
Then 65% of 40+x% of 40=75% of 80
65100×40x100×=75100×80
x=(75×8010065×40100)×10040%
=(6026)×10040 %=85%

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