In an exam, 40% failed in Physics, 30% in Chemistry, and 20% in both. If 250 students passed in both, the total number of students is: MCQ with Answer and Explanation

Question

In an exam, 40% failed in Physics, 30% in Chemistry, and 20% in both. If 250 students passed in both, the total number of students is:

A. 400

B. 450

C. 500

D. 550

Answer: Option C

Solution (By JKSSB Mock Tests)

Failed in at least one = 40+30-20=50%, passed both = 50% = 250 → total = 500.

This question belongs to: Maths Percentage

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Question #1

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A number is increased by 10% and then the new number is decreased by 10%. If the final result is 99, find the original number.

A. 90

B. 105

C. 100

D. 95

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Correct Answer: Option C

Explanation:
1.1 × 0.9 = 0.99, 0.99x = 99 → x = 100.

This question belongs to: Maths Percentage

Question #2

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If 40% of a number exceeds 25% of the same number by 36, find the number.

A. 200

B. 260

C. 220

D. 240

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Correct Answer: Option D

Explanation:
0.4x - 0.25x = 0.15x = 36 x = 240.

This question belongs to: Maths Percentage

Question #3

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A man's income is Rs. 18000, he saves 25%. His savings are:

A. 4000

B. 4200

C. 5000

D. 4500

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Correct Answer: Option D

Explanation:
25% of 18000 = 4500.

This question belongs to: Maths Percentage

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