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 sums solve correcty is
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Let the question solved correctly by Mohan = X ;
and number of question solved wrongly by Mohan = 30 - X ;
According to the question,
3X - (30 - X) x 2 = 40
⇒ 3x - 60 + 2x = 40
⇒ 5x - 60 = 40
⇒ 5x = 40 + 60 ⇒ x = 100/5 = 20
∴ Mohan attempted 20 questionscorrectly .
and number of question solved wrongly by Mohan = 30 - X ;
According to the question,
3X - (30 - X) x 2 = 40
⇒ 3x - 60 + 2x = 40
⇒ 5x - 60 = 40
⇒ 5x = 40 + 60 ⇒ x = 100/5 = 20
∴ Mohan attempted 20 questionscorrectly .
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