Come up with a question and stream of consciousness reasoning that would justify this answer: 687

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The question is: Bob is building a garden on his land, and he wants it to be fenced in to keep out varmints. The garden is a rectangular plot 225 feet long by 125 feet wide. He also wants to have a small 3-foot wide gate to walk through and a larger 10-foot wide gate to move his gardening equipment through. How much fencing is Bob going to need to fence in his garden, taking into account the two gates?
Stream of consciousness: The perimeter of the garden is 2 * 225 + 2 * 125 = 450 + 250 = 700 feet. Minus the two gates, he will need at least 700 - 3 - 10 = 687 feet of fencing.
