A number is erroneously multiplied by 5/3 instead of 3/5. Percentage error in calculation: MCQ with Answer and Explanation

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A number is erroneously multiplied by 5/3 instead of 3/5. Percentage error in calculation:

A. 177.78%

B. 180%

C. 150%

D. 166.67%

Answer: Option A

Solution (By JKSSB Mock Tests)

Correct = (3/5)x, wrong = (5/3)x. % 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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A number is increased by 15% and then decreased by 15%. If the resulting number is 782, what was the original number?

A. 800

B. 780

C. 750

D. 820

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Correct Answer: Option A

Explanation:
1.15 × 0.85 = 0.9775. 0.9775x = 782 → x = 782/0.9775 = 800.

This question belongs to: Maths Percentage

Question #2

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Buy cycle for Rs. 1400, sell at 15% loss. Selling price:

A. 1190

B. 1150

C. 1210

D. 1160

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Correct Answer: Option A

Explanation:
1400 × 0.85 = 1190.

This question belongs to: Maths Percentage

Question #3

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A town's population increases by 10% in the first year and 20% in the second year. What is the net percentage increase?

A. 33%

B. 32%

C. 35%

D. 30%

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Correct Answer: Option B

Explanation:
Net change = 10 + 20 + ((10 * 20) / 100) = 30 + 2 = 32%.

This question belongs to: Maths Percentage

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