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. 250

B. 300

C. 280

D. 320

Answer: Option B

Solution (By JKExamLibrary)

0.3x = 90 → x = 300.

This question belongs to: Maths Percentage

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Question #1

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Price of pen up 15%. By what % reduce consumption so that expenditure rises only 5%?

A. 8.7%

B. 10%

C. 8%

D. 9.09%

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Correct Answer: Option A

Explanation:
1.15 × x = 1.05 → x = 1.05/1.15 ≈ 0.91304, reduction = 8.7%.

This question belongs to: Maths Percentage

Question #2

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The population of a town increases by 15% in the first year and decreases by 10% in the second year. If the population at the end of second year is 10350, what was the population at the beginning?

A. 9000

B. 10500

C. 10000

D. 9500

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Correct Answer: Option C

Explanation:
Net multiplier = 1.15 × 0.9 = 1.035. Population = 10350/1.035 = 10000.

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Question #3

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A student multiplied a number by 2/3 instead of 3/2. What is the percentage error?

A. 55.55%

B. 50%

C. 66.66%

D. 44.44%

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Correct Answer: Option A

Explanation:
True = 3/2x. False = 2/3x. Error = (3/2 - 2/3)x = (5/6)x. % Error = ((5/6) / (3/2)) * 100 = (10/18) * 100 = 55.55%.

This question belongs to: Maths Percentage

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