He Sun bought 3 skirts for s dollars each and a jacket that costs 5 times as much as each skirt. She spent a total of $280. How much did the jacket cost?

The jacket cost 5 times as much as each skirt cost, which was s dollars, so it cost 5s dollars. She bought 3 skirts, so in total she spent 3s+5s dollars, or 8s dollars. If 8s=280, s=35. Each skirt cost s=35 dollars, and the jacket was 5 times that.

5*35=175

The jacket cost $175.