Question

Debbie has been training for the Bayside Bike Race. The first week she trained, she rode 4 days and took the same two routes each day: 12 miles through her neighborhood in the morning and a shorter route on a park trail in the evening. By the end of the week, she had ridden a total of 72 miles.
Which equation can you use to find how many miles, x, Debbie rode each evening?

Answer 1

Each day she rode 12 + x miles, and she rode 4 days, so use
4(12 + x) = 72.
(Or equivalently 48 + 4x = 72, which gives x = 6.)