1. Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is
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By: anil on 05 May 2019 01.57 am
Let no. of correct questions be $$x$$ and incorrect be $$y$$ => $$x + y = 30$$ Also, $$3x - 2y = 40$$ Solving above equations, we get : => $$x = 20$$ and $$y = 10$$ => No. of correct sums = 20
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