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In a class, the ratio of boys to girls is 3:2. If there are 30 boys, how many gi

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Question: In a class, the ratio of boys to girls is 3:2. If there are 30 boys, how many girls are there?

Options:

  1. 20
  2. 25
  3. 15
  4. 10

Correct Answer: 20

Solution: 

If the ratio of boys to girls is 3:2, then for every 3 boys, there are 2 girls. If there are 30 boys, the number of girls can be calculated as (30 boys * 2 girls) / 3 boys = 20 girls.

In a class, the ratio of boys to girls is 3:2. If there are 30 boys, how many gi

Practice Questions

Q1
In a class, the ratio of boys to girls is 3:2. If there are 30 boys, how many girls are there?
  1. 20
  2. 25
  3. 15
  4. 10

Questions & Step-by-Step Solutions

In a class, the ratio of boys to girls is 3:2. If there are 30 boys, how many girls are there?
  • Step 1: Understand the ratio of boys to girls, which is 3:2. This means for every 3 boys, there are 2 girls.
  • Step 2: Identify how many boys there are in the class. In this case, there are 30 boys.
  • Step 3: Set up a proportion based on the ratio. Since the ratio is 3 boys to 2 girls, we can write it as 3/2.
  • Step 4: Use the number of boys to find the number of girls. We can set up the equation: (30 boys * 2 girls) / 3 boys.
  • Step 5: Calculate the number of girls. (30 * 2) / 3 = 60 / 3 = 20 girls.
  • Step 6: Conclude that there are 20 girls in the class.
  • Ratio and Proportion – Understanding and applying the concept of ratios to find equivalent quantities.
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