The price of petrol increases by 30%. By what percent should a person reduce consumption so that expenditure increases only by 10%? MCQ with Answer and Explanation
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Question #1
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25% reduction in sugar price lets a person buy 8 kg more for Rs. 200. Reduced price per kg:
Correct Answer: Option A
Explanation:
Original price x, consumption y, xy=200. New 0.75x(y+8)=200 → 150 + 6x = 200 → 6x=50 → x=25/3≈8.33, reduced price 0.75*x = 6.25. So Rs. 6.25.
Original price x, consumption y, xy=200. New 0.75x(y+8)=200 → 150 + 6x = 200 → 6x=50 → x=25/3≈8.33, reduced price 0.75*x = 6.25. So Rs. 6.25.
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Maths
Percentage
Question #2
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In an exam, 70% passed English, 65% Maths, 27% failed both, 248 passed both. Total students:
Correct Answer: Option A
Explanation:
Failed English=30%, Failed Maths=35%. Failed both=27%. Passed both = 100 - (30+35-27) = 62%. 62% = 248 → total = 400.
Failed English=30%, Failed Maths=35%. Failed both=27%. Passed both = 100 - (30+35-27) = 62%. 62% = 248 → total = 400.
This question belongs to:
Maths
Percentage
Question #3
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Price of an article reduced by 15%, new price Rs. 170. Original price was:
Correct Answer: Option B
Explanation:
Original × 0.85 = 170 → original = 200.
Original × 0.85 = 170 → original = 200.
This question belongs to:
Maths
Percentage
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