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Prem scored 85 marks on a test containing 100 problems. He attempted all the problems and his score was calculated by subtracting two times the number of

wrong answers from the number of correct answers. How many problems did she score correctly?



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Let number of correct answers be 'x'
Therefore number of wrong answers = (100-x)

As per question,

∴ 85 = x-2(100-x)
∴ 85 = x-200+2x
∴ 3x = 285
∴ x = 95
6 4 6
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