A mixture contains 25% alcohol. In 80 litres, amount of alcohol is: MCQ with Answer and Explanation

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A mixture contains 25% alcohol. In 80 litres, amount of alcohol is:

A. 22 L

B. 18 L

C. 20 L

D. 16 L

Answer: Option C

Solution (By JKExamLibrary)

25% of 80 = 20 litres.

This question belongs to: Maths Percentage

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Question #1

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Find the single equivalent discount for successive discounts of 10% and 20%.

A. 30%

B. 25%

C. 32%

D. 28%

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Correct Answer: Option D

Explanation:
Equivalent discount = a + b - (ab / 100). 10 + 20 - (10 * 20 / 100) = 30 - 2 = 28%.

This question belongs to: Maths Percentage

Question #2

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A candidate wins an election by securing 58% of the total votes. If the majority is 640 votes, what is the total number of votes cast?

A. 3500

B. 4000

C. 3000

D. 4500

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Correct Answer: Option B

Explanation:
Winner = 58%, Loser = 42%. Difference = 16%. 16% of Total = 640. Total = 640 * (100 / 16) = 4000.

This question belongs to: Maths Percentage

Question #3

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A number is added to 30% of itself and the sum is 780. Find the number.

A. 600

B. 550

C. 500

D. 650

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Correct Answer: Option A

Explanation:
x + 0.3x = 1.3x = 780 → x = 600.

This question belongs to: Maths Percentage

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