40% failed in Physics, 30% in Chemistry, 20% in both. % passed in both: MCQ with Answer and Explanation

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40% failed in Physics, 30% in Chemistry, 20% in both. % passed in both:

A. 50%

B. 40%

C. 30%

D. 60%

Answer: Option A

Solution (By JKSSB Mock Tests)

Failed at least one = 40+30-20=50%, passed both = 50%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

Marked 20% above CP, discount 10%. Profit %:

A. 8%

B. 6%

C. 10%

D. 12%

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Correct Answer: Option A

Explanation:
CP=100, MP=120, SP=108, profit 8%.

This question belongs to: Maths Percentage

Question #2

A number increased by 25% becomes 150. The number is:

A. 115

B. 120

C. 110

D. 125

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Correct Answer: Option B

Explanation:
1.25x = 150 → x = 120.

This question belongs to: Maths Percentage

Question #3

A man's salary was reduced by 20%. By what percent must it be raised to bring it back to the original?

A. 25%

B. 20%

C. 30%

D. 22.5%

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Correct Answer: Option A

Explanation:
After reduction 80, to reach 100, increase = (20/80)×100 = 25%.

This question belongs to: Maths Percentage

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