A number is multiplied by 5/3 instead of 3/5. What is the percentage error? MCQ with Answer and Explanation

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

A. 180%

B. 166.67%

C. 177.78%

D. 150%

Answer: Option C

Solution (By JKSSB Mock Tests)

Correct = 3x/5, wrong = 5x/3. Error % = [(5/3 - 3/5)/(3/5)]×100 = (16/9)×100 ≈ 177.78%.

This question belongs to: Maths Percentage

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Question #1

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The price of an article is reduced by 20% and then increased by 30%. Find the net change in the price.

A. 10% increase

B. 4% decrease

C. 4% increase

D. No change

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Correct Answer: Option C

Explanation:
0.8 × 1.3 = 1.04, 4% increase.

This question belongs to: Maths Percentage

Question #2

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Convert 3/4 into a percentage.

A. 70%

B. 65%

C. 75%

D. 60%

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Correct Answer: Option C

Explanation:
(3/4) × 100 = 75%.

This question belongs to: Maths Percentage

Question #3

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A train 200 m long passes a platform 300 m long in 25 seconds. Find the speed of the train in kmph.

A. 54 kmph

B. 72 kmph

C. 66 kmph

D. 60 kmph

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Correct Answer: Option B

Explanation:
Total distance = 200+300=500 m, time 25 sec, speed = 500/25 = 20 m/s = 20 × 18/5 = 72 kmph.

This question belongs to: Maths Percentage

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