In a class of 50, 40% are girls. Number of boys is: MCQ with Answer and Explanation

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In a class of 50, 40% are girls. Number of boys is:

A. 32

B. 28

C. 25

D. 30

Answer: Option D

Solution (By JKSSB Mock Tests)

60% of 50 = 30 boys.

This question belongs to: Maths Percentage

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Question #1

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12% of a number is 96. The number is:

A. 800

B. 700

C. 600

D. 900

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Correct Answer: Option A

Explanation:
0.12x = 96 → x = 800.

This question belongs to: Maths Percentage

Question #2

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A man spends 25% on rent, 20% of remainder on food, 15% of remainder on education, saves Rs. 15300. Income:

A. 25000

B. 32000

C. 30000

D. 28000

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Correct Answer: Option C

Explanation:
Rent 0.25I, left 0.75I. Food 0.15I, left 0.6I. Education 0.09I, left 0.51I = 15300 → I=30000.

This question belongs to: Maths Percentage

Question #3

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A man spends 30% on rent, 20% of the remainder on food, and 25% of the next remainder on education. If he saves Rs. 5460, find his monthly income.

A. Rs. 13500

B. Rs. 12000

C. Rs. 13000

D. Rs. 12500

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Correct Answer: Option C

Explanation:
Rent 30%, left 70%. Food 20% of 70%=14% of income, left 56%. Education 25% of 56%=14% of income, left 42% = 5460 → income = 5460/0.42 = 13000.

This question belongs to: Maths Percentage

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