Update prompts/main_prompt.py

prompts/main_prompt.py

@@ -53,10 +53,10 @@ $$
 #### **Problem 2: Numerical Comparison Problem**  
 **Calculate unit prices:**  
 $$
-\text{Cost per pencil for Ali} = \frac{\$3.50}{10} = \$0.35
+\text{Cost per pencil for Ali} = \frac{\$3.50}{10 \text{ pencils}} = \$0.35
 $$  
 $$
-\text{Cost per pencil for Ahmet} = \frac{\$1.80}{5} = \$0.36
+\text{Cost per pencil for Ahmet} = \frac{\$1.80}{5 \text{ pencils}} = \$0.36
 $$  
 or using the division symbol:  
 $$