A number increased by 15% is 138. The number is: MCQ with Answer and Explanation

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A number increased by 15% is 138. The number is:

A. 120

B. 110

C. 115

D. 125

Answer: Option A

Solution (By JKSSB Mock Tests)

1.15x = 138 → x = 120.

This question belongs to: Maths Percentage

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Question #1

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20% of A = 30% of B = 1/6 of C. Ratio A:B:C:

A. 15:10:12

B. 10:15:18

C. 15:10:18

D. 18:10:15

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Correct Answer: Option C

Explanation:
Let 20%A=30%B=C/6 = k. A=5k, B=10k/3, C=6k → multiply by 3: 15:10:18.

This question belongs to: Maths Percentage

Question #2

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In an election, 10% of the votes were invalid. The winning candidate got 60% of the valid votes and won by a majority of 1800 votes. What was the total number of votes?

A. 8000

B. 9000

C. 12000

D. 10000

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Correct Answer: Option D

Explanation:
Valid votes V = 0.9T. Winner got 0.6V = 0.54T, loser 0.4V = 0.36T, margin 0.18T = 1800 → T = 10000.

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Question #3

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A number is increased by 50% and then decreased by 50%. The net change is:

A. 25% increase

B. 25% decrease

C. No change

D. 50% decrease

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Correct Answer: Option B

Explanation:
1.5 × 0.5 = 0.75, 25% decrease.

This question belongs to: Maths Percentage

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