In an exam, 70% passed English, 65% Maths, 27% failed both, 248 passed both. Total students: MCQ with Answer and Explanation
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Question #1
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The ratio of boys to girls in a school is 3:2. If 20% of boys and 25% of girls are adults, what percentage of the total students are non-adults?
Correct Answer: Option D
Explanation:
Let boys = 60, girls = 40. Total = 100. Adult boys = 20% of 60 = 12. Adult girls = 25% of 40 = 10. Total adults = 22. Non-adults = 100 - 22 = 78. Percentage = 78%.
Let boys = 60, girls = 40. Total = 100. Adult boys = 20% of 60 = 12. Adult girls = 25% of 40 = 10. Total adults = 22. Non-adults = 100 - 22 = 78. Percentage = 78%.
This question belongs to:
Maths
Percentage
Question #2
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The price of an article is increased by 25% and then decreased by x%. If the net effect is no change, find x.
Correct Answer: Option A
Explanation:
1.25 × (1 - x/100) = 1 → 1 - x/100 = 0.8 → x/100 = 0.2 → x=20.
1.25 × (1 - x/100) = 1 → 1 - x/100 = 0.8 → x/100 = 0.2 → x=20.
This question belongs to:
Maths
Percentage
Question #3
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What is 150% of 40?
Correct Answer: Option A
Explanation:
150% of 40 = (150 / 100) * 40 = 1.5 * 40 = 60.
150% of 40 = (150 / 100) * 40 = 1.5 * 40 = 60.
This question belongs to:
Maths
Percentage
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