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A school has 120 students. If 30% of them are girls, how many boys are there?

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Question: A school has 120 students. If 30% of them are girls, how many boys are there?

Options:

  1. 84
  2. 36
  3. 72
  4. 48

Correct Answer: 84

Solution: 

30% of 120 is 36, so there are 120 - 36 = 84 boys.

A school has 120 students. If 30% of them are girls, how many boys are there?

Practice Questions

Q1
A school has 120 students. If 30% of them are girls, how many boys are there?
  1. 84
  2. 36
  3. 72
  4. 48

Questions & Step-by-Step Solutions

A school has 120 students. If 30% of them are girls, how many boys are there?
  • Step 1: Find out how many girls are in the school by calculating 30% of 120.
  • Step 2: To find 30% of 120, multiply 120 by 0.30 (which is the decimal form of 30%).
  • Step 3: Calculate 120 * 0.30 = 36. This means there are 36 girls in the school.
  • Step 4: To find the number of boys, subtract the number of girls from the total number of students.
  • Step 5: Calculate 120 - 36 = 84. This means there are 84 boys in the school.
  • Percentage Calculation – Understanding how to calculate a percentage of a total number.
  • Subtraction – Using subtraction to find the remaining quantity after a portion has been identified.
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