In a class of 40, 30% are girls. Number of boys is: MCQ with Answer and Explanation

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In a class of 40, 30% are girls. Number of boys is:

A. 26

B. 30

C. 32

D. 28

Answer: Option D

Solution (By JKSSB Mock Tests)

70% of 40 = 28 boys.

This question belongs to: Maths Percentage

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Question #1

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A shopkeeper sells an article at 15% profit. Had he bought it at 10% less and sold it for Rs. 10 more, he would have gained 30%. Find the cost price.

A. Rs. 400

B. Rs. 700

C. Rs. 500

D. Rs. 600

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Correct Answer: Option C

Explanation:
CP=x, SP=1.15x. New CP=0.9x, new SP=1.15x+10 = 1.3×0.9x = 1.17x → 0.02x=10 → x=500.

This question belongs to: Maths Percentage

Question #2

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If the cost price of 12 articles is equal to the selling price of 10 articles, what is the profit percent?

A. 15%

B. 18%

C. 20%

D. 25%

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Correct Answer: Option C

Explanation:
Let CP of 1 article = Re.1. CP of 12 = 12, SP of 10 = 12 → SP of 1 = 1.2, profit% = 20%.

This question belongs to: Maths Percentage

Question #3

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A student has to secure 33% marks to pass. He gets 120 marks and fails by 12 marks. Find the maximum marks.

A. 500

B. 400

C. 450

D. 350

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Correct Answer: Option B

Explanation:
Passing marks = 120 + 12 = 132. 33% of Maximum = 132. Maximum = 132 * (100 / 33) = 400.

This question belongs to: Maths Percentage

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