The Number of bums solved correctly : If

Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtain 40 marks. The number of sums solved correctly is

  1. 25
  2. 10
  3. 15
  4. 20
Anurag Mishra Professor Asked on 1st August 2015 in Maths.
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    Best answer

    Answer: (4) 20
    Explanation:-

    Let be the currently question solved by Mohan = P
    According to the question,
    3 x X – (30 – X) x 2 = 40
    3 X – 30 x 2 + X x 2 = 40
    3 X – 60 + 2 X = 40
    5 X = 40 + 60
    5 X  = 100
    X = 100/5
    X = 20
    Hence, the currently question solved by Mohan is 20.

    Anurag Mishra Professor Answered on 1st August 2015.
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