If 40% of a number is added to another, second becomes 120% of itself. Ratio of first to second: MCQ with Answer and Explanation

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If 40% of a number is added to another, second becomes 120% of itself. Ratio of first to second:

A. 2:3

B. 1:3

C. 1:2

D. 3:2

Answer: Option C

Solution (By JKSSB Mock Tests)

0.4F + S = 1.2S → 0.4F = 0.2S → F/S = 0.2/0.4 = 1/2.

This question belongs to: Maths Percentage

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Question #1

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

A. 9000

B. 8750

C. 10000

D. 8000

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Correct Answer: Option B

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

Question #2

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If 20% of a number is added to 60, the result is the number itself. Find the number.

A. 80

B. 85

C. 75

D. 70

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Correct Answer: Option C

Explanation:
0.2x + 60 = x → 0.8x = 60 → x = 75.

This question belongs to: Maths Percentage

Question #3

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Salary increased by 20% then decreased by 20%. Net effect:

A. 4% increase

B. 2% decrease

C. 4% decrease

D. No change

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Correct Answer: Option C

Explanation:
1.2 × 0.8 = 0.96, 4% decrease.

This question belongs to: Maths Percentage

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