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

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Question: In a class of 30 students, 18 are girls. What percentage of the class are boys? (2023)

Options:

Correct Answer: 40%

Exam Year: 2023

Solution:

If there are 30 students and 18 are girls, then there are 12 boys. The percentage of boys = (12/30) * 100 = 40%.

In a class of 30 students, 18 are girls. What percentage of the class are boys? (2023)

In a class of 30 students, 18 are girls. What percentage of the class are boys? (2023)

Step 1: Start with the total number of students in the class, which is 30.
Step 2: Identify the number of girls in the class, which is 18.
Step 3: Calculate the number of boys by subtracting the number of girls from the total number of students: 30 - 18 = 12 boys.
Step 4: To find the percentage of boys, use the formula: (number of boys / total number of students) * 100.
Step 5: Plug in the numbers: (12 / 30) * 100.
Step 6: Calculate the result: 12 divided by 30 equals 0.4, and then multiply by 100 to get 40.
Step 7: Conclude that 40% of the class are boys.

Percentage Calculation – Understanding how to calculate the percentage of a subset relative to a total.
Basic Arithmetic – Performing basic operations such as subtraction and multiplication.