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. 110

B. 100

C. 90

D. 80

Answer: Option B

Solution (By JKSSB Mock Tests)

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

6.25% expressed as a fraction is:

A. 1/12

B. 1/16

C. 1/20

D. 1/18

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Correct Answer: Option B

Explanation:
6.25/100 = 1/16.

This question belongs to: Maths Percentage

Question #2

A's marks 25% more than B, B's 20% less than C. A=150, find C:

A. 140

B. 120

C. 130

D. 150

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Correct Answer: Option D

Explanation:
A=1.25B, B=0.8C → A=1.25×0.8C = C, so C=150.

This question belongs to: Maths Percentage

Question #3

The difference between 60% of a number and 40% of the same number is 100. What is 30% of that number?

A. 160

B. 150

C. 120

D. 140

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Correct Answer: Option B

Explanation:
0.6x - 0.4x = 0.2x = 100 → x = 500, 30% = 150.

This question belongs to: Maths Percentage

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