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2014-08-30T22:20:26+05:30

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Let us say Tina has written correct answers to N questions.

Then total marks she has got : N * 5 - 2 * 10 = 5 N - 20  = 30

5 N = 20+30 = 50

N = 10

Tina attempted and gave 10 correct answers. there were totally 20 questions.

1 5 1