Price of an article is cut by 25%. By what % must consumption increase so that expenditure remains same? MCQ with Answer and Explanation
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Question #1
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If the radius of a circle is decreased by 30%, the area decreases by:
Correct Answer: Option A
Explanation:
New area = 0.7² = 0.49, decrease 51%.
New area = 0.7² = 0.49, decrease 51%.
This question belongs to:
Maths
Percentage
Question #2
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A man gave 20% of his money to his son, 30% of the remainder to his daughter, and 10% of what then remained to charity. He was left with Rs. 10080. Find the total money.
Correct Answer: Option C
Explanation:
Let total = T. Son 20%, left 80%. Daughter 30% of 80% = 24% of T, left 56%. Charity 10% of 56% = 5.6% of T, left 50.4% = 10080 → T = 10080/0.504 = 20000.
Let total = T. Son 20%, left 80%. Daughter 30% of 80% = 24% of T, left 56%. Charity 10% of 56% = 5.6% of T, left 50.4% = 10080 → T = 10080/0.504 = 20000.
This question belongs to:
Maths
Percentage
Question #3
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In a mixture of 70 litres, the ratio of milk to water is 5:2. How much water must be added to make the ratio 2:3?
Correct Answer: Option C
Explanation:
Milk = (5/7)×70 = 50 L, water = 20 L. For milk:water = 2:3, water = (3/2)×50 = 75 L. Add 75-20 = 55 L.
Milk = (5/7)×70 = 50 L, water = 20 L. For milk:water = 2:3, water = (3/2)×50 = 75 L. Add 75-20 = 55 L.
This question belongs to:
Maths
Percentage
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