Percentage Aptitude Questions Practice Question and Answer
8 Q: The radius of circle is increased by 1%. How much does the area of the circle increased?
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Answer : 1. "2.01% "
Q: A person who spends $$ 16{2\over3}\% $$ of his income is able to save 1200 per month. His monthly expenses (in) is:
1200 05ee0d41f8c4c964f73d9980b
5ee0d41f8c4c964f73d9980b- 11,200false
- 22,400true
- 33,000false
- 43,200false
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Answer : 2. "2,400 "
Q: In a moter of 120 machine parts, 5 % parts were defective, in another motor of 80 machine parts, 10 % parts were defective. For the two motors considered together, the percentage of defective machine parts were
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5ef56f01196e681f76d94b38- 16.5false
- 27.5false
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Answer : 3. "7"
Q: In an examination, 93 % of students passed and 259 failed. The total number of students appearing at the examination was:
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5ef478edf2ebd073795cb3f2- 13950false
- 23850false
- 33700true
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Answer : 3. " 3700 "
Q: The price of sugar increases by 15%. By what percentage should the consumption of sugar be decreased so that the expenditure on the purchase of sugar remains the same? [Give your answer correct to 2 decimal places.]
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643d140332185cce373eec85- 111.11%false
- 212.5%false
- 314.16%false
- 413.04%true
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Answer : 4. "13.04%"
Explanation :
To solve this problem, let's denote:
- Initial price of sugar = P
- Initial quantity consumed = Q
- Initial expenditure = PQ
After the price increases by 15%, the new price becomes 1.15P.
To keep the expenditure constant, the new quantity consumed (let's call it Q') can be calculated using the formula:
New expenditure = New price × New quantity
Setting the new expenditure equal to the initial expenditure:
PQ = (1.15P) * Q'
Now, solve for Q':
Q' = PQ / (1.15P)
Simplify:
Q' = Q / 1.15
Now, let's find the percentage decrease in consumption:
Percentage decrease = [(Q - Q') / Q] * 100
Substituting the value of Q':
Percentage decrease = [(Q - (Q / 1.15)) / Q] * 100
Percentage decrease = [(Q * (1 - 1/1.15)) / Q] * 100
Percentage decrease ≈ [(1 - 0.8696) * 100] ≈ 13.04%
Therefore, the consumption of sugar should be decreased by approximately 13.04% to keep the expenditure on the purchase of sugar the same after a 15% increase in price.
Q: In a college 12% of all the students are interested in sports, 10% of the total students are interested in singing and three-fourth of the total students are interested in dancing and remaining 15 students are not interested in any activity, How many total students are there in the college?
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Answer : 2. "500"
Q: By reducing the circumference of a circle by 50 percent, by what percentage will its area decrease?
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5f97fd0ed8201a50c268dea6- 112.5 %false
- 225 %false
- 375 %true
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Answer : 3. "75 % "
Q: Two numbers are 30% and 37% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?
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- 27%false
- 311.11%true
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