In a class of 50 students, 40% are girls. How many boys are there in the class?

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Question: In a class of 50 students, 40% are girls. How many boys are there in the class? (2023)

Options:

Correct Answer: 30

Exam Year: 2023

Solution:

Number of girls = 40% of 50 = 20. Therefore, number of boys = 50 - 20 = 30.

In a class of 50 students, 40% are girls. How many boys are there in the class? (2023)

In a class of 50 students, 40% are girls. How many boys are there in the class? (2023)

Step 1: Find out how many girls are in the class by calculating 40% of 50.
Step 2: To calculate 40% of 50, multiply 50 by 0.40 (which is the decimal form of 40%).
Step 3: The result of 50 multiplied by 0.40 is 20. This means there are 20 girls in the class.
Step 4: To find the number of boys, subtract the number of girls from the total number of students.
Step 5: The total number of students is 50, so subtract 20 (the number of girls) from 50.
Step 6: 50 - 20 equals 30. Therefore, there are 30 boys in the class.

Percentage Calculation – Understanding how to calculate a percentage of a total (in this case, 40% of 50 students).
Subtraction – Using subtraction to find the remaining quantity after determining one part of a whole (subtracting the number of girls from the total number of students to find the number of boys).