Percentage Practice Question and Answer
8 Q: The ratio of the number of boys and girls in a college is 7 : 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?
1612 05f97f8f4d8201a50c268b81b
5f97f8f4d8201a50c268b81b- 18 : 9false
- 221 : 22true
- 317 : 18false
- 424 : 9false
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Answer : 2. "21 : 22"
Q: The average mathematics marks of two section A and B of class IX in the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratio of number of student of section A and B is:
1611 05f15453d4cff381d16260554
5f15453d4cff381d16260554- 17 : 8false
- 28 : 5false
- 38 : 7true
- 47 : 5false
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Answer : 3. "8 : 7"
Q: The income of C is 20 % more than B's and the income of B is 25 % more than A’s. Find by how much percent is C's income more than A’s?
1608 05ee0d809ca41b347ed3512ea
5ee0d809ca41b347ed3512ea- 1150 %false
- 250 %true
- 325 %false
- 435 %false
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Answer : 2. "50 % "
Q: The passing score of an exam is 33 percent. Anshul scored 160 marks but failed by 38 marks. Then what percentage marks Anshul got.
1603 060373cf9cd43d04a8f4a763e
60373cf9cd43d04a8f4a763e- 130 %false
- 2$$ {26{2\over 3}}{\%} $$true
- 325 %false
- 4$$ {28{3\over 4}}{\%} $$false
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Answer : 2. "$$ {26{2\over 3}}{\%} $$"
Q: In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls.
1602 05dd62f0ca1c5834595c3d7e9
5dd62f0ca1c5834595c3d7e9- 140 %true
- 250 %false
- 355 %false
- 460 %false
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Answer : 1. "40 % "
Q: If the population of a town is 12.000 and the population increases at the rate of 10% per annum, then find the population. after 3 years.
1597 06426e27c72ca731a990e28e2
6426e27c72ca731a990e28e2- 115,972true
- 212,200false
- 311,200false
- 410,200false
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Answer : 1. "15,972"
Explanation :
To find the population after 3 years given that it increases at a rate of 10% per annum, you can use the formula for exponential growth:
𝑃=𝑃0×(1+𝑟)𝑛P=P0×(1+r)n
Where:
- 𝑃P = Population after 𝑛n years
- 𝑃0P0 = Initial population
- 𝑟r = Rate of increase (in decimal form)
- 𝑛n = Number of years
Given:
- 𝑃0=12,000P0=12,000 (Initial population)
- 𝑟=0.10r=0.10 (10% increase per annum)
- 𝑛=3n=3 (Number of years)
Substitute these values into the formula:
𝑃=12,000×(1+0.10)3P=12,000×(1+0.10)3
𝑃=12,000×(1.10)3P=12,000×(1.10)3
𝑃=12,000×(1.331)P=12,000×(1.331)
𝑃=15,972P=15,972
So, the population after 3 years would be approximately 15,972.
Q: A student scored 32 % marks in science subjects out of 300. How much should he score in language papers out of 200 if he is to get overall 46 % marks?
1596 05ef480bf9d32d072c24c9e51
5ef480bf9d32d072c24c9e51- 166 %false
- 260 %false
- 372 %false
- 467 %true
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Answer : 4. "67 % "
Q: If the present population of a village is 55,566, which was 35000 2 years ago, then find the rate of increase of population per year.
1592 16343f1901bfb042f96b0286c
6343f1901bfb042f96b0286c- 124%false
- 225%false
- 323%false
- 426%true
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