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In a class of 30 students, 18 are girls. What percentage of the class are boys?

Question

In a class of 30 students, 18 are girls. What percentage of the class are boys?

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Solution

1. ### Break Down the Problem

To find the percentage of boys in the class, we first need to determine how many boys are in the class. We can do this by subtracting the number of girls from the total number of students.

2. ### Relevant Concepts

The formula to find the percentage of boys is: Percentage of boys=(Number of boysTotal number of students)×100 \text{Percentage of boys} = \left( \frac{\text{Number of boys}}{\text{Total number of students}} \right) \times 100

3. ### Analysis and Detail

  1. Total number of students = 30
  2. Number of girls = 18
  3. Number of boys = Total number of students - Number of girls Number of boys=3018=12 \text{Number of boys} = 30 - 18 = 12
  4. Now, we can plug the number of boys into the percentage formula: Percentage of boys=(1230)×100 \text{Percentage of boys} = \left( \frac{12}{30} \right) \times 100

4. ### Verify and Summarize

Calculating the percentage: Percentage of boys=(1230)×100=40% \text{Percentage of boys} = \left( \frac{12}{30} \right) \times 100 = 40\%

Final Answer

The percentage of the class that are boys is 40%.

This problem has been solved

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