20% of a number is 30. 60% of that number is: MCQ with Answer and Explanation

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20% of a number is 30. 60% of that number is:

A. 100

B. 60

C. 80

D. 90

Answer: Option D

Solution (By JKSSB Mock Tests)

Number = 30/0.2 = 150; 60% of 150 = 90.

This question belongs to: Maths Percentage

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Question #1

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

A. 27

B. 24

C. 30

D. 33

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Correct Answer: Option A

Explanation:
45% of 60 = 27 boys.

This question belongs to: Maths Percentage

Question #2

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130% of 130 is:

A. 179

B. 149

C. 169

D. 159

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Correct Answer: Option C

Explanation:
1.3 × 130 = 169.

This question belongs to: Maths Percentage

Question #3

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A number divided by 4, quotient increased by 25% then decreased by 20% gives 150. Number:

A. 540

B. 640

C. 560

D. 600

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Correct Answer: Option D

Explanation:
(N/4)×1.25×0.8 = (N/4)×1 = 150 → N/4=150 → N=600.

This question belongs to: Maths Percentage

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