A number is increased by 10% and then the new number is decreased by 10%. If the final result is 99, find the original number. MCQ with Answer and Explanation

Question

A number is increased by 10% and then the new number is decreased by 10%. If the final result is 99, find the original number.

A. 100

B. 95

C. 90

D. 105

Answer: Option A

Solution (By JKSSB Mock Tests)

1.1 × 0.9 = 0.99, 0.99x = 99 → x = 100.

This question belongs to: Maths Percentage

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Question #1

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If A is 20% more than B, then B is what percentage less than A?

A. 16.67%

B. 33.33%

C. 20%

D. 25%

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Correct Answer: Option A

Explanation:
Formula: (R / (100 + R)) * 100. Here R = 20. (20 / 120) * 100 = 100 / 6 = 16.67%.

This question belongs to: Maths Percentage

Question #2

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Cost of 20 items = SP of 15 items. Profit %:

A. 25%

B. 40%

C. 33.33%

D. 30%

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Correct Answer: Option C

Explanation:
Profit = (5/15)×100 = 33.33%.

This question belongs to: Maths Percentage

Question #3

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If speed decreases by 20%, by what percentage will the time required to cover the same distance increase?

A. 25%

B. 20%

C. 30%

D. 33.33%

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Correct Answer: Option A

Explanation:
Time increase = (20 / 80) * 100 = 25%.

This question belongs to: Maths Percentage

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