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In a class, 30% of the students are girls. If there are 120 students in total, h

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Question: In a class, 30% of the students are girls. If there are 120 students in total, how many boys are there?

Options:

  1. 70
  2. 80
  3. 90
  4. 100

Correct Answer: 80

Solution: 

Number of girls = 30% of 120 = 36. Therefore, number of boys = 120 - 36 = 84.

In a class, 30% of the students are girls. If there are 120 students in total, h

Practice Questions

Q1
In a class, 30% of the students are girls. If there are 120 students in total, how many boys are there?
  1. 70
  2. 80
  3. 90
  4. 100

Questions & Step-by-Step Solutions

In a class, 30% of the students are girls. If there are 120 students in total, how many boys are there?
  • Step 1: Find out how many girls are in the class by calculating 30% of the total number of students.
  • Step 2: To calculate 30% of 120, multiply 120 by 0.30 (which is the decimal form of 30%).
  • Step 3: The result from Step 2 gives you the number of girls in the class.
  • Step 4: Subtract the number of girls from the total number of students (120) to find the number of boys.
  • Step 5: The result from Step 4 is the number of boys in the class.
  • Percentage Calculation – Understanding how to calculate a percentage of a total number.
  • Subtraction – Using subtraction to find the remaining quantity after determining a part of the whole.
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