A's income 30% less than B, B's 20% less than C. C's income is what % more than A's? MCQ with Answer and Explanation

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

A. 78.57%

B. 66.67%

C. 72.5%

D. 80%

Answer: Option A

Solution (By JKSSB Mock Tests)

A=0.7B, B=0.8C → A=0.56C → C = A/0.56, more = (0.44/0.56)×100 = 78.57%.

This question belongs to: Maths Percentage

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Question #1

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If 60% of a number is subtracted from another number, the second number reduces to 52% of itself. Find the ratio of the first to the second.

A. 4:5

B. 3:4

C. 2:3

D. 5:8

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Correct Answer: Option A

Explanation:
y - 0.6x = 0.52y → 0.48y = 0.6x → x/y = 0.48/0.6 = 4/5.

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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. 50 L

B. 45 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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72% passed an exam. Failures = 560. Total examinees:

A. 2200

B. 2000

C. 1800

D. 2500

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Correct Answer: Option B

Explanation:
28% = 560, total = 560/0.28 = 2000.

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