Five boxes of crackers cost $$ \$ 9 $$. At this rate, how much do 20 boxes cost?

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To determine the cost of 20 boxes of crackers based on the given rate, follow these steps:

1. **Find the Cost per Box:**
   
   You know that 5 boxes cost \$9. To find the cost of one box:
   
   $$
   \text{Cost per box} = \frac{\$9}{5} = \$1.80 \text{ per box}
   $$

2. **Calculate the Cost for 20 Boxes:**
   
   Multiply the cost per box by the number of boxes you want to buy (20):
   
   $$
   \text{Total cost} = 20 \times \$1.80 = \$36.00
   $$
   
   **Alternatively, using a proportion:**
   
   $$
   \frac{5 \text{ boxes}}{\$9} = \frac{20 \text{ boxes}}{x}
   $$
   
   Cross-multiply to solve for $$ x $$:
   
   $$
   5x = 20 \times 9 \
   5x = 180 \
   x = \frac{180}{5} \
   x = \$36
   $$

**Answer:** 20 boxes of crackers cost **\$36**.
20 boxes of crackers cost \$36.

Five boxes of crackers cost \( \$ 9 \). At this rate, how much do 20 boxes cost?

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