Number of boys 40% more than girls, total 120. Number of boys: MCQ with Answer and Explanation

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Number of boys 40% more than girls, total 120. Number of boys:

A. 65

B. 75

C. 60

D. 70

Answer: Option D

Solution (By JKExamLibrary)

Girls = x, boys = 1.4x, total 2.4x=120 → x=50, boys=70.

This question belongs to: Maths Percentage

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Question #1

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A man buys a cycle for Rs. 1400 and sells it at a loss of 15%. What is the selling price?

A. Rs. 1210

B. Rs. 1180

C. Rs. 1190

D. Rs. 1150

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Correct Answer: Option C

Explanation:
SP = 1400 × 0.85 = 1190.

This question belongs to: Maths Percentage

Question #2

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A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation?

A. 36%

B. 64%

C. 60%

D. 40%

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Correct Answer: Option B

Explanation:
True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.

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Question #3

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In an election, 10% of voters did not cast their votes. The winner obtained 60% of the cast votes and won by 720 votes. What was the total number of voters on the voting list?

A. 3600

B. 4400

C. 5000

D. 4000

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Correct Answer: Option D

Explanation:
Winner got 60%, Loser 40% of cast votes. Difference = 20% of cast votes = 720. Cast votes = 720 * 5 = 3600. Cast votes = 90% of total list. Total = 3600 / 0.9 = 4000.

This question belongs to: Maths Percentage

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