There are 20 girls and 15 boys in a class.
What is the ratio of number of girls to the number of boys?

Answer

To find the ratio of the number of girls to the number of boys in the class, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the numbers of girls and boys**:
- Number of girls = 20
- Number of boys = 15

2. **Write the ratio of girls to boys**:
- The ratio can be written as \( \frac{\text{Number of girls}}{\text{Number of boys}} \).
- So, it becomes \( \frac{20}{15} \).

3. **Simplify the ratio**:
- To simplify \( \frac{20}{15} \), we can divide both the numerator and the denominator by their greatest common divisor (GCD).
- The GCD of 20 and 15 is 5.
- Dividing both by 5:
- \( \frac{20 \div 5}{15 \div 5} = \frac{4}{3} \).

4. **Express the simplified ratio**:
- The simplified ratio of girls to boys can be expressed as 4:3.

### Final Answer:
The ratio of the number of girls to the number of boys in the class is **4:3**.

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