Population of a city is 1,20,000, increasing at 10% per year. After 1 year, population is: MCQ with Answer and Explanation
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Question #1
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A hockey team won 45% of 60 matches. Matches lost:
Correct Answer: Option A
Explanation:
Lost = 55% of 60 = 33.
Lost = 55% of 60 = 33.
This question belongs to:
Maths
Percentage
Question #2
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A 60-litre mixture contains milk and water in the ratio 2:1. How many litres of the mixture should be withdrawn and replaced with water to make the ratio 1:2?
Correct Answer: Option D
Explanation:
Milk=40 L, water=20 L. Withdraw x L mixture: milk removed = (2/3)x, water removed = (1/3)x. After replacement, milk = 40 - 2x/3, water = 20 - x/3 + x = 20 + 2x/3. Ratio 1:2 → (40 - 2x/3)/(20 + 2x/3) = 1/2 → 2(40 - 2x/3) = 20 + 2x/3 → 80 - 4x/3 = 20 + 2x/3 → 60 = 2x → x = 30.
Milk=40 L, water=20 L. Withdraw x L mixture: milk removed = (2/3)x, water removed = (1/3)x. After replacement, milk = 40 - 2x/3, water = 20 - x/3 + x = 20 + 2x/3. Ratio 1:2 → (40 - 2x/3)/(20 + 2x/3) = 1/2 → 2(40 - 2x/3) = 20 + 2x/3 → 80 - 4x/3 = 20 + 2x/3 → 60 = 2x → x = 30.
This question belongs to:
Maths
Percentage
Question #3
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Price up 20%, person buys 2 kg less for Rs. 60. Original price/kg:
Correct Answer: Option D
Explanation:
Original price x, xy=60. New 1.2x(y-2)=60 → 1.2×60 - 2.4x =60 → x=5.
Original price x, xy=60. New 1.2x(y-2)=60 → 1.2×60 - 2.4x =60 → x=5.
This question belongs to:
Maths
Percentage
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