Answer:
90
Explanation:
First, we would need to figure out the multiples of 18.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180.
Now, let's figure out the multiples of 30.
30, 60, 90, 120, 150, 180.
The numbers match up! This means that in 90 days the soccer team and football team will practice together, and the same happens on day 180.