In a class of 40, 30% are girls. Number of boys is: MCQ with Answer and Explanation
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Question #1
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If A is 20% less than B, then B is what percentage more than A?
Correct Answer: Option B
Explanation:
Formula: (R / (100 - R)) * 100. Here R = 20. (20 / 80) * 100 = (1 / 4) * 100 = 25%.
Formula: (R / (100 - R)) * 100. Here R = 20. (20 / 80) * 100 = (1 / 4) * 100 = 25%.
This question belongs to:
Maths
Percentage
Question #2
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A's marks 30% more than B, B's 20% less than C. A=156, C's marks:
Correct Answer: Option B
Explanation:
A=1.3B, B=0.8C → A=1.04C → C=156/1.04=150.
A=1.3B, B=0.8C → A=1.04C → C=156/1.04=150.
This question belongs to:
Maths
Percentage
Question #3
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A's marks 25% more than B, B's 20% less than C. A=150, find C:
Correct Answer: Option B
Explanation:
A=1.25B, B=0.8C → A=1.25×0.8C = C, so C=150.
A=1.25B, B=0.8C → A=1.25×0.8C = C, so C=150.
This question belongs to:
Maths
Percentage
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