Coal price up 15%, expenditure to rise only 8%. Reduce consumption by: MCQ with Answer and Explanation

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Coal price up 15%, expenditure to rise only 8%. Reduce consumption by:

A. 6.08%

B. 6.5%

C. 7%

D. 5.5%

Answer: Option A

Solution (By JKSSB Mock Tests)

1.15 × x = 1.08 → x = 1.08/1.15 ≈ 0.93913, reduction 6.09%, round to 6.08%.

This question belongs to: Maths Percentage

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Question #1

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Price of rice reduced by 20%, allowing a person to buy 5 kg more for Rs. 120. Reduced price per kg is:

A. Rs. 3.6

B. Rs. 4.8

C. Rs. 5.4

D. Rs. 4

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Correct Answer: Option B

Explanation:
Original x, xy=120. New 0.8x(y+5)=120 → 96+4x=120 → x=6, reduced price = 4.8.

This question belongs to: Maths Percentage

Question #2

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In an exam, maximum marks 800, passing 45%. Pass marks are:

A. 380

B. 340

C. 320

D. 360

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Correct Answer: Option D

Explanation:
45% of 800 = 360.

This question belongs to: Maths Percentage

Question #3

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A student multiplied a number by 5/3 instead of 3/5. What is the percentage error?

A. 177.77%

B. 64%

C. 150%

D. 100%

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Correct Answer: Option A

Explanation:
True = 3/5x. False = 5/3x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (3/5)) * 100 = (16/9) * 100 = 177.77%.

This question belongs to: Maths Percentage

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