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

Question Report Error

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

A. 30%

B. 60%

C. 40%

D. 50%

Answer: Option D

Solution (By JKExamLibrary)

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 Report Error

55% of a number is 33 less than 70% of the same number. The number is:

A. 220

B. 180

C. 200

D. 240

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
0.7x - 0.55x = 33 → 0.15x = 33 → x = 220.

This question belongs to: Maths Percentage

Question #2 Report Error

What is 20% of 50% of 300?

A. 25

B. 30

C. 40

D. 35

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
0.2 × 0.5 × 300 = 30.

This question belongs to: Maths Percentage

Question #3 Report Error

Rice price reduced 20%, buys 10 kg more for Rs. 200. Reduced price/kg:

A. Rs. 4

B. Rs. 3.5

C. Rs. 4.5

D. Rs. 5

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Original price x, xy=200. 0.8x(y+10)=200 → 160+8x=200 → x=5, reduced 4.

This question belongs to: Maths Percentage

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