A student divided a number by 2 instead of multiplying it by 2. What is the percentage error? MCQ with Answer and Explanation

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A student divided a number by 2 instead of multiplying it by 2. What is the percentage error?

A. 60%

B. 75%

C. 50%

D. 100%

Answer: Option B

Solution (By JKSSB Mock Tests)

True value = 2x. False value = x/2 = 0.5x. Error = 1.5x. % Error = (1.5 / 2) * 100 = 75%.

This question belongs to: Maths Percentage

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Question #1

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A's income is 25% more than B's, and B's income is 20% less than C's. What percent is A's income of C's?

A. 90%

B. 95%

C. 100%

D. 105%

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Correct Answer: Option C

Explanation:
Let C=100, B=80, A=80×1.25=100. A is 100% of C.

This question belongs to: Maths Percentage

Question #2

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A number increased by 10% then decreased by 10% gives net:

A. 2% decrease

B. 1% decrease

C. 0%

D. 1% increase

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Correct Answer: Option B

Explanation:
1.1 × 0.9 = 0.99, 1% decrease.

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Question #3

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Two alloys contain 70% and 40% copper respectively. In what ratio must they be mixed to obtain an alloy containing 50% copper?

A. 1:2

B. 3:2

C. 2:1

D. 1:1

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Correct Answer: Option A

Explanation:
By alligation: (70-50):(50-40) = 20:10 = 2:1. The ratio of the alloys is inverse: 1:2.

This question belongs to: Maths Percentage

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