The ratio of the number of girls to that of boys in a school is `9: 11.` If the number of boys in the school is 2035, find :
the number of girls in the school.

Answer

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

### Step-by-Step Solution:

1. **Understand the Ratio**:
The ratio of girls to boys is given as 9:11. This means for every 9 girls, there are 11 boys.

2. **Let the Number of Girls be x**:
We can denote the number of girls in the school as \( x \).

3. **Given Number of Boys**:
We know that the number of boys in the school is 2035.

4. **Set Up the Ratio Equation**:
According to the ratio, we can express it as:
\[ \frac{x}{2035} = \frac{9}{11} \]

5. **Cross Multiply to Solve for x**:
To eliminate the fraction, we can cross-multiply:
\[ 11x = 9 \times 2035 \]

6. **Calculate the Right Side**:
Now, we need to calculate \( 9 \times 2035 \):
\[ 9 \times 2035 = 18315 \]

7. **Divide by 11 to Find x**:
Now, we can find \( x \) by dividing both sides by 11:
\[ x = \frac{18315}{11} \]

8. **Perform the Division**:
Calculating \( \frac{18315}{11} \) gives us:
\[ x = 1665 \]

9. **Conclusion**:
Therefore, the number of girls in the school is \( 1665 \).

### Final Answer:
The number of girls in the school is **1665**.