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. 166.67%

B. 150%

C. 180%

D. 177.78%

Answer: Option D

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 person measured a line as 5.05 cm instead of its true length of 5.00 cm. What is the percentage error?

A. 1%

B. 2%

C. 0.5%

D. 1.5%

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Correct Answer: Option A

Explanation:
Error = 5.05 - 5.00 = 0.05. % Error = (0.05 / 5.00) * 100 = 1%.

This question belongs to: Maths Percentage

Question #2

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A student scored 30% marks and failed by 45 marks. Another scored 42% marks and got 45 more than pass. Pass marks:

A. 250

B. 270

C. 300

D. 225

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Correct Answer: Option B

Explanation:
0.3M + 45 = 0.42M - 45 → 0.12M = 90 → M=750. Pass = 0.3×750+45 = 270.

This question belongs to: Maths Percentage

Question #3

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The population of a town is 120000. It increases by 15% in the first year and decreases by 10% in the second year. What is the population after two years?

A. 123000

B. 125000

C. 126500

D. 124200

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Correct Answer: Option D

Explanation:
120000 × 1.15 × 0.9 = 124200.

This question belongs to: Maths Percentage

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