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2015-02-27T23:53:04+05:30

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In order to keep up the same level of achievement, the ratio of "number of successfully completed questions" to "the number of attempted questions" should remain same.

more problems to complete = 45
let number of problems 
he need to successfully complete = x

 \frac{12}{15}= \frac{x}{45}  \\ \\x= \frac{12}{15} \times 45\\ \\ x=12 \times 3=36

He should complete 36 questions out of 45 successfully.

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