If 30% of a number is 90, the number is: MCQ with Answer and Explanation

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If 30% of a number is 90, the number is:

A. 320

B. 280

C. 300

D. 250

Answer: Option C

Solution (By JKSSB Mock Tests)

0.3x = 90 → x = 300.

This question belongs to: Maths Percentage

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Question #1

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What is 5% of 300?

A. 15

B. 10

C. 25

D. 20

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Correct Answer: Option A

Explanation:
5% of 300 = (5 / 100) * 300 = 15.

This question belongs to: Maths Percentage

Question #2

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A man buys an article for Rs. 80 and marks it at Rs. 120. He gives a discount of 10% on the marked price. What is his profit percent?

A. 32%

B. 35%

C. 33%

D. 30%

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Correct Answer: Option B

Explanation:
SP = 120×0.9=108. Profit = 28, % = (28/80)×100 = 35%.

This question belongs to: Maths Percentage

Question #3

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The ratio of the ages of A and B is 5:7. After 10 years, the ratio will be 7:9. Find the present age of A.

A. 20 years

B. 35 years

C. 30 years

D. 25 years

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Correct Answer: Option D

Explanation:
Let ages 5x, 7x. (5x+10)/(7x+10) = 7/9 → 45x+90 = 49x+70 → 4x=20 → x=5, A=25.

This question belongs to: Maths Percentage

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