Answer:
120 miles
Step-by-step explanation:
Let d represent the number of miles driven on the first day. Then 1.5 times d came to 180 miles. Dividing both sides of this equation by 1.5 to isolate d, we get:
180 miles
--------------- = 120 miles
1.5
Thefamily drove 120 miles during the first day of their trip.