85% passed English, 75% Maths, 65% both. % failed both: MCQ with Answer and Explanation

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85% passed English, 75% Maths, 65% both. % failed both:

A. 10%

B. 12%

C. 5%

D. 8%

Answer: Option C

Solution (By JKSSB Mock Tests)

Pass at least one = 85+75-65=95%, fail both = 5%.

This question belongs to: Maths Percentage

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Question #1

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A number is increased by 20% and then decreased by 20%. What is the net change?

A. 2% decrease

B. No change

C. 4% decrease

D. 4% increase

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Correct Answer: Option C

Explanation:
Net change = x^2 / 100 % decrease. 20^2 / 100 = 400 / 100 = 4% decrease.

This question belongs to: Maths Percentage

Question #2

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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. 1.5%

B. 2%

C. 1%

D. 0.5%

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Correct Answer: Option C

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

This question belongs to: Maths Percentage

Question #3

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If the selling price of an article is doubled, the profit triples. Find the original profit percent.

A. 75%

B. 125%

C. 100%

D. 50%

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Correct Answer: Option C

Explanation:
Let CP = C, SP = S, profit = S - C. New SP = 2S, new profit = 3(S-C) = 2S - C. So 3S - 3C = 2S - C → S = 2C. Profit% = (S-C)/C × 100 = (2C-C)/C × 100 = 100%.

This question belongs to: Maths Percentage

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