At Rosemont Middle School, $$ 55 \% $$ of the student body purchases their lunch at school. 1. Write that as a ratio of part to whole.

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To express $$ 55\% $$ as a ratio of part to whole, follow these steps:

1. **Understand Percentage as a Ratio:**
   
   - **Percentage Meaning:** $$ 55\% $$ means 55 out of 100.
   - **Ratio Form:** This can be written as $$ 55:100 $$.

2. **Simplify the Ratio:**
   
   - **Find the Greatest Common Divisor (GCD):** The GCD of 55 and 100 is 5.
   - **Divide Both Terms by the GCD:**
     $$
     \frac{55}{5} : \frac{100}{5} = 11:20
     $$
   
   - **Simplified Ratio:** $$ 11:20 $$

**Final Answer:**  
The ratio of students who purchase lunch to the total student body is $$ \mathbf{11:20} $$.
The ratio of students who purchase lunch to the total student body is 11:20.

At Rosemont Middle School, of the student body purchases their lunch at school.

Write that as a ratio of part to whole.

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At Rosemont Middle School, of the student body purchases their lunch at school. Write that as a ratio of part to whole.