The price of petrol increases by 30%. By what percent should a person reduce consumption so that expenditure increases only by 10%? MCQ with Answer and Explanation

Question

The price of petrol increases by 30%. By what percent should a person reduce consumption so that expenditure increases only by 10%?

A. 18%

B. 16.67%

C. 15.38%

D. 14.5%

Answer: Option C

Solution (By JKSSB Mock Tests)

1.3 × x = 1.1 → x = 1.1/1.3 ≈ 0.84615, reduction 15.38%.

This question belongs to: Maths Percentage

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Question #1

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Difference between SP at 12% profit and 8% loss is Rs. 60. CP:

A. 300

B. 320

C. 280

D. 250

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Correct Answer: Option A

Explanation:
1.12CP - 0.92CP = 0.2CP = 60 → CP = 300.

This question belongs to: Maths Percentage

Question #2

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A student scored 20% marks and failed by 36 marks. Another student scored 30% marks and got 24 marks more than the passing marks. Find the passing marks.

A. 156

B. 140

C. 160

D. 180

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Correct Answer: Option A

Explanation:
0.2M + 36 = 0.3M - 24 → 0.1M = 60 → M = 600. Passing marks = 0.2×600+36 = 156.

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Question #3

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The present ages of A and B are in the ratio 6:7. After 8 years, the ratio of their ages will be 8:9. Find the sum of their present ages.

A. 56 years

B. 48 years

C. 52 years

D. 60 years

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Correct Answer: Option C

Explanation:
Ages 6x,7x. (6x+8)/(7x+8)=8/9 → 54x+72=56x+64 → 2x=8 → x=4. Sum=6x+7x=13x=52.

This question belongs to: Maths Percentage

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