Jen has 2 gallons of ketchup. Each ketchup bottle can hold $\frac{1}{9}$ of a gallon. We want to find how many bottles Jen can fill.

1. Problem Description

Jen has 2 gallons of ketchup. Each ketchup bottle can hold $\frac{1}{9}$ of a gallon. We want to find how many bottles Jen can fill.

2. Solution Steps

To find the number of bottles Jen can fill, we need to divide the total amount of ketchup (2 gallons) by the amount each bottle can hold ($\frac{1}{9}$ of a gallon).

So we need to calculate $2 \div \frac{1}{9}$.

Dividing by a fraction is the same as multiplying by its reciprocal. The reciprocal of $\frac{1}{9}$ is $\frac{9}{1}$ or $9$.

Therefore, $2 \div \frac{1}{9} = 2 \times 9$.

$2 \times 9 = 18$.

3. Final Answer

Jen can fill 18 bottles.