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. 100%

C. 50%

D. 75%

Answer: Option D

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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In an election between two candidates, one got 35% of the total valid votes and lost by 1500 votes. Find the total valid votes.

A. 5000

B. 4500

C. 5500

D. 4000

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Correct Answer: Option A

Explanation:
Loser = 35%, Winner = 65%. Difference = 30%. 30% of Total = 1500. Total = 5000.

This question belongs to: Maths Percentage

Question #2

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Number increased 40% then decreased 30%. Net change:

A. 2% decrease

B. 10% decrease

C. 2% increase

D. No change

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Correct Answer: Option A

Explanation:
1.4 × 0.7 = 0.98, 2% decrease.

This question belongs to: Maths Percentage

Question #3

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If A is 20% less than B, then B is what percentage more than A?

A. 15%

B. 25%

C. 20%

D. 30%

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Correct Answer: Option B

Explanation:
Formula: (R / (100 - R)) * 100. Here R = 20. (20 / 80) * 100 = (1 / 4) * 100 = 25%.

This question belongs to: Maths Percentage

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