Julie can make 5 shirts in 8 days. How many days would it take her to make 15 shirts?

Cross multiply and solve for x.

5/8 = 15/x

The answer is 24 days.

To find out how many days it would take for Julie to make 15 shirts, we can set up a proportion using the given information.

Let's define the variables:
x = number of days it would take to make 15 shirts

According to the given information, we know that Julie can make 5 shirts in 8 days. Therefore, the proportion can be set up as:

5 shirts / 8 days = 15 shirts / x days

To solve for x, we can cross-multiply and then divide:
5x = 15 * 8
5x = 120
x = 120 / 5
x = 24

So, it would take Julie 24 days to make 15 shirts.