A number increased by 20% then by 25% becomes 150. Original number: MCQ with Answer and Explanation

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A number increased by 20% then by 25% becomes 150. Original number:

A. 90

B. 110

C. 80

D. 100

Answer: Option D

Solution (By JKSSB Mock Tests)

x × 1.2 × 1.25 = 150 → 1.5x = 150 → x = 100.

This question belongs to: Maths Percentage

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Question #1

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A's income is 30% more than B's, B's is 20% more than C's. A's income is what percent more than C's?

A. 60%

B. 52%

C. 50%

D. 56%

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Correct Answer: Option D

Explanation:
C=100, B=120, A=120×1.3=156, so A is 56% more than C.

This question belongs to: Maths Percentage

Question #2

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In a mixture of 70 litres, the ratio of milk to water is 5:2. How much water must be added to make the ratio 2:3?

A. 45 L

B. 50 L

C. 55 L

D. 60 L

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Correct Answer: Option C

Explanation:
Milk = (5/7)×70 = 50 L, water = 20 L. For milk:water = 2:3, water = (3/2)×50 = 75 L. Add 75-20 = 55 L.

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Question #3

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Candidate got 35% of valid votes and lost by 2100. 20% votes invalid. Total voters:

A. 9000

B. 8000

C. 8750

D. 10000

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Correct Answer: Option C

Explanation:
Valid votes V, winner 65%V, loser 35%V, margin 30%V=2100 → V=7000. Total T, 0.8T=7000 → T=8750.

This question belongs to: Maths Percentage

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