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answer and explanation, Solve this math problem show the complete solution. Include what topic this question is.

This problem falls under the **Percentages** topic, which is often used in everyday applications to compare parts to a whole.

### Problem:
"In a class, 60% of the students are girls. If the total number of students is 30, what is the number of boys?"

### Solution:

1. **Understand the Question**:
   - Total students = \( 30 \)
   - Percentage of girls = \( 60\% \)
   - We need to find the number of boys.

2. **Find the Number of Girls**:
   The number of girls is \( 60\% \) of \( 30 \). To calculate:
   \[
   \text{Number of girls} = \frac{60}{100} \times 30 = 18
   \]

3. **Find the Number of Boys**:
   Since the total number of students is \( 30 \), and there are \( 18 \) girls:
   \[
   \text{Number of boys} = 30 - 18 = 12
   \]

### Final Answer:
The number of boys is **C. 12**.

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Would you like further clarification on this or practice on similar problems?

### Relative Questions:
1. How do you calculate percentages of a given number?
2. What is the formula for finding a percentage decrease or increase?
3. Can you solve similar problems with different percentages and totals?
4. What are common real-life applications of percentages?
5. How do percentages relate to fractions and decimals?

### Tip:
When solving percentage problems, always convert the percentage into a fraction or decimal before applying it to the total number.

In a class, 60% of the students are girls. If the total number of students is 30, what is the number of boys?

Learn how to solve a percentage problem to find the number of boys in a class where 60% of the students are girls and the total number of students is 30. Suitable for Grades 5-7.

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