If a number is decreased by 10%, it becomes 90. What is the number? MCQ with Answer and Explanation

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If a number is decreased by 10%, it becomes 90. What is the number?

A. 80

B. 90

C. 110

D. 100

Answer: Option D

Solution (By JKExamLibrary)

Let the number be x. x * 0.90 = 90. x = 90 / 0.90 = 100.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1 Report Error

What is 45% of 200 minus 20% of 150?

A. 65

B. 50

C. 60

D. 55

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Correct Answer: Option C

Explanation:
90 - 30 = 60.

This question belongs to: Maths Percentage

Question #2 Report Error

What percent is 250 g of 2 kg?

A. 15%

B. 10%

C. 12.5%

D. 20%

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Correct Answer: Option C

Explanation:
2 kg = 2000 g, (250/2000)×100 = 12.5%.

This question belongs to: Maths Percentage

Question #3 Report Error

A number is multiplied by 5/3 instead of 3/5. What is the percentage error?

A. 177.78%

B. 150%

C. 166.67%

D. 180%

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Correct Answer: Option A

Explanation:
Correct = 3x/5, wrong = 5x/3. Error % = [(5/3 - 3/5)/(3/5)]×100 = (16/9)×100 ≈ 177.78%.

This question belongs to: Maths Percentage

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