In a class of 40 students, 25% are girls. How many boys are there in the class?

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Question: In a class of 40 students, 25% are girls. How many boys are there in the class?

Options:

Correct Answer: 30

Solution:

Number of girls = 25% of 40 = 10. Number of boys = 40 - 10 = 30.

In a class of 40 students, 25% are girls. How many boys are there in the class?

In a class of 40 students, 25% are girls. How many boys are there in the class?

Step 1: Find out how many girls are in the class by calculating 25% of 40 students.
Step 2: To calculate 25% of 40, multiply 40 by 0.25 (which is the decimal form of 25%).
Step 3: 40 multiplied by 0.25 equals 10. So, there are 10 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: Subtract 10 (girls) from 40 (total students): 40 - 10 = 30.
Step 6: Therefore, there are 30 boys in the class.

Percentage Calculation – Understanding how to calculate a percentage of a total amount.
Basic Arithmetic – Performing simple subtraction to find the remaining quantity after calculating a part.