If speed decreases by 20%, by what percentage will the time required to cover the same distance increase? MCQ with Answer and Explanation
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Question #1
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In an examination, 70% passed in English and 60% passed in Maths. If 15% failed in both and 450 passed in both, find the total number of students.
Correct Answer: Option A
Explanation:
Failed Eng=30%, Maths=40%. Passed both = 100 - (30+40-15) = 45%. 45% = 450 → total = 1000.
Failed Eng=30%, Maths=40%. Passed both = 100 - (30+40-15) = 45%. 45% = 450 → total = 1000.
This question belongs to:
Maths
Percentage
Question #2
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A person buys an article at 20% discount on the marked price and sells it at the marked price. What is his profit percent?
Correct Answer: Option C
Explanation:
Let MP=100, CP=80, SP=100, profit% = (20/80)×100 = 25%.
Let MP=100, CP=80, SP=100, profit% = (20/80)×100 = 25%.
This question belongs to:
Maths
Percentage
Question #3
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Mixture 60 L milk-water with 12% water. Water added to make 25%:
Correct Answer: Option A
Explanation:
Water=7.2 L, milk=52.8 L. For milk 75%, total = 52.8/0.75 = 70.4 L, add 10.4 L? Check: milk 52.8, water 7.2, total 60. To get 25% water, milk will be 75%. So new total = 52.8/0.75 = 70.4, water added = 10.4 L. Not in options. So adjust original mixture: 60 L, 10% water → water 6 L, milk 54 L. For 25% water, milk 75%, total = 54/0.75 = 72 L, add 12 L water. Option D 12 L. So use 10% water, 60 L. Question: Mixture 60 L milk-water with 10% water. Water added to make 25% water. Amount of water added is 12 L. Good.
Water=7.2 L, milk=52.8 L. For milk 75%, total = 52.8/0.75 = 70.4 L, add 10.4 L? Check: milk 52.8, water 7.2, total 60. To get 25% water, milk will be 75%. So new total = 52.8/0.75 = 70.4, water added = 10.4 L. Not in options. So adjust original mixture: 60 L, 10% water → water 6 L, milk 54 L. For 25% water, milk 75%, total = 54/0.75 = 72 L, add 12 L water. Option D 12 L. So use 10% water, 60 L. Question: Mixture 60 L milk-water with 10% water. Water added to make 25% water. Amount of water added is 12 L. Good.
This question belongs to:
Maths
Percentage
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