A tables with no data, showing Number of Cubic Yards, Cost per Cubic Yard, and Total. The first row is Compost. The second row is Topsoil. The third row is Total.
Helena uses a mixture of compost and topsoil in her garden. She purchased a total of 10 cubic yards of compost and topsoil for $180. If compost costs $25 per cubic yard and topsoil costs $15 per cubic yard, how many cubic yards of topsoil did she purchase?
3
4.5
5.5
7
