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Mohan gets 3 marks for each correct sum ...

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

A

25

B

10

C

15

D

20

Text Solution

Verified by Experts

The correct Answer is:
D
माना कि मोहन द्वारा सही हल किये गये जोड़ों की संख्या x है।
`therefore` गलत हल किये गये जोड़ों की संख्या (30-x)
प्रश्नानुसार
3 `xx` x - 2(30-x) = 40
3x - 60 + 2x = 40
5x = 100
x = 20
अर्थात्‌ मोहन ने कुल 20 सही जोड़ हल किए।
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