In a class of 60 students, 55% are girls. Number of boys is: MCQ with Answer and Explanation

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In a class of 60 students, 55% are girls. Number of boys is:

A. 30

B. 33

C. 24

D. 27

Answer: Option D

Solution (By JKSSB Mock Tests)

45% of 60 = 27 boys.

This question belongs to: Maths Percentage

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Question #1

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A student has to secure 40% marks to pass. He gets 150 marks and fails by 10 marks. What are the maximum marks?

A. 300

B. 400

C. 350

D. 450

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Correct Answer: Option B

Explanation:
Passing marks = 150 + 10 = 160. 40% of Maximum = 160. Maximum = 160 * (100 / 40) = 400.

This question belongs to: Maths Percentage

Question #2

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A shopkeeper sells an article at 20% profit. If bought at 20% less and sold for Rs. 10 less, gain would be 25%. Find CP.

A. Rs. 55

B. Rs. 45

C. Rs. 50

D. Rs. 40

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Correct Answer: Option C

Explanation:
CP = x, SP = 1.2x. New CP = 0.8x, new SP = 1.2x - 10. New SP = 1.25×0.8x = x. So 1.2x - 10 = x → 0.2x = 10 → x = 50.

This question belongs to: Maths Percentage

Question #3

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A's marks 30% more than B, B's 20% less than C. A=156, C's marks:

A. 130

B. 160

C. 150

D. 140

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Correct Answer: Option C

Explanation:
A=1.3B, B=0.8C → A=1.04C → C=156/1.04=150.

This question belongs to: Maths Percentage

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