The ratio of the number of girls to the number of boys in a town is 90%. If the total number of boys and girls in the town is 190, how many girls are in the town?

Options

A. 100
B. 110
C. 90
D. 80

Explanation

To solve the problem, we need to find the number of girls in the town given the ratio of girls to boys and the total number of children.

### Step-by-step Solution:

1. **Understand the Ratio**: The ratio of the number of girls (G) to the number of boys (B) is given as 90%. This can be expressed as:
\[ \frac{G}{B} = 0.9 \quad \text{or} \quad G = 0.9B \]

2. **Express Total Children**: The total number of boys and girls in the town is given as 190. Therefore, we can write:
\[ G + B = 190 \]

3. **Substitute the Ratio into the Total**: Now, substitute \( G \) from the first equation into the total equation:
\[ 0.9B + B = 190 \]

4. **Combine Like Terms**: This simplifies to:
\[ 1.9B = 190 \]

5. **Solve for B**: To find the number of boys, divide both sides by 1.9:
\[ B = \frac{190}{1.9} = 100 \]

6. **Find the Number of Girls**: Now that we have the number of boys, we can find the number of girls using the ratio:
\[ G = 0.9B = 0.9 \times 100 = 90 \]

7. **Conclusion**: Therefore, the number of girls in the town is:
\[ \text{Number of girls} = 90 \]

### Final Answer:
The number of girls in the town is **90**.