Ratios and Percentages Quiz - CBSE Class 8 Mathematics

Free practice quiz: Ratios and Percentages (CBSE Class 8 Mathematics). 15 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. If the ratio of boys to girls in a class is 3:5, and there are 12 boys, how many girls are there?

   1. 15
   2. 20
   3. 25
   4. 30
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   Answer: B. 20

   Let the ratio of boys to girls be 3:5. If there are 12 boys, then 3x = 12, so x = 4. The number of girls is 5x = 5 * 4 = 20.

2. Express the ratio 15:25 in its simplest form.

   1. 1:2
   2. 3:5
   3. 5:3
   4. 2:1
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   Answer: B. 3:5

   Divide both parts of the ratio by their greatest common divisor, which is 5. 15/5 = 3 and 25/5 = 5. Therefore, the simplest form is 3:5.

3. A student scores 75 marks out of 150. What is the percentage obtained by the student?

   1. 25%
   2. 50%
   3. 75%
   4. 100%
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   Answer: B. 50%

   (75/150)*100 = 50%

4. The population of a town increased from 5000 to 6000. What is the percentage increase in population?

   1. 10%
   2. 20%
   3. 30%
   4. 40%
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   Answer: B. 20%

   Increase in population = 6000 - 5000 = 1000. Percentage increase = (Increase/Original population) * 100 = (1000/5000) * 100 = 20%

5. A mixture contains milk and water in the ratio 5:2. If the total quantity of mixture is 35 liters, find the quantity of milk.

   1. 25 liters
   2. 10 liters
   3. 15 liters
   4. 20 liters
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   Answer: A. 25 liters

   The ratio of milk to water is 5:2. The sum of the ratio parts is 5+2 = 7. The quantity of milk is (5/7) * 35 liters = 25 liters.

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