In an examination, 70% passed in English, 65% in Maths and 15% failed in both subjects. If 300 students passed in both, total number of students was: MCQ with Answer and Explanation

Question

In an examination, 70% passed in English, 65% in Maths and 15% failed in both subjects. If 300 students passed in both, total number of students was:

A. 500

B. 650

C. 600

D. 550

Answer: Option C

Solution (By JKSSB Mock Tests)

Failed Eng=30%, Maths=35%. Passed both = 100 - (30+35-15) = 50%. 50% of total = 300 → total = 600.

This question belongs to: Maths Percentage

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Question #1

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What is 30% of 30% of 200?

A. 18

B. 24

C. 30

D. 20

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Correct Answer: Option A

Explanation:
0.3 × 0.3 × 200 = 18.

This question belongs to: Maths Percentage

Question #2

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If 20% of a number added to 40 gives the number. The number is:

A. 50

B. 40

C. 55

D. 45

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Correct Answer: Option A

Explanation:
0.2x + 40 = x → 0.8x = 40 → x = 50.

This question belongs to: Maths Percentage

Question #3

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Difference between a number and its 2/5 is 510. 10% of that number:

A. 85

B. 90

C. 80

D. 95

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Correct Answer: Option A

Explanation:
x - 0.4x = 0.6x = 510 → x = 850, 10% = 85.

This question belongs to: Maths Percentage

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