In a class, three are 30 boys and 25 girls. Find the ratio of the number of
boys to that of total numbers of students.

Answer

To solve the problem of finding the ratio of the number of boys to the total number of students in the class, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the number of boys and girls**:
- Number of boys = 30
- Number of girls = 25

2. **Calculate the total number of students**:
- Total number of students = Number of boys + Number of girls
- Total number of students = 30 + 25 = 55

3. **Set up the ratio of boys to total students**:
- Ratio of boys to total students = Number of boys : Total number of students
- Ratio = 30 : 55

4. **Simplify the ratio**:
- To simplify the ratio, we find the greatest common divisor (GCD) of 30 and 55.
- The GCD of 30 and 55 is 5.
- Now, divide both numbers by their GCD:
- 30 ÷ 5 = 6
- 55 ÷ 5 = 11
- Therefore, the simplified ratio is 6 : 11.

5. **State the final answer**:
- The ratio of the number of boys to the total number of students is 6 : 11.