A city is planning to build a small garden using only Basalt and Limestone. The table below shows the weight per volume for each rock type.
| Rock type | Weight per volume (lb/ft) |
|---|---|
| Basalt | 180 |
| Limestone | 120 |
The rocks in the garden will have a total weight of 800 pounds. If 2 cubic feet of Basalt is used, which of the following equations could show the relationship for , the volume in cubic feet, of Limestone used?
