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A class has 30 students, and 40% of them are girls. How many boys are there in t

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Question: A class has 30 students, and 40% of them are girls. How many boys are there in the class? (2023)

Options:

  1. 12
  2. 18
  3. 20
  4. 24

Correct Answer: 18

Exam Year: 2023

Solution: 

Number of girls = 40% of 30 = 12. Therefore, number of boys = 30 - 12 = 18.

A class has 30 students, and 40% of them are girls. How many boys are there in t

Practice Questions

Q1
A class has 30 students, and 40% of them are girls. How many boys are there in the class? (2023)
  1. 12
  2. 18
  3. 20
  4. 24

Questions & Step-by-Step Solutions

A class has 30 students, and 40% of them 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 30 students.
  • Step 2: To calculate 40% of 30, multiply 30 by 0.40 (which is the decimal form of 40%).
  • Step 3: The result of the multiplication gives you the number of girls in the class.
  • Step 4: Subtract the number of girls from the total number of students (30) to find the number of boys.
  • Percentage Calculation – Understanding how to calculate a percentage of a total number.
  • Basic Arithmetic – Performing simple subtraction to find the remaining quantity after calculating a part.
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