A town is organizing a fourth of July parade. there will be two sizes of floats in the parade a ...

A town is organizing a fourth of July parade. there will be two sizes of floats in the parade a space of 10 ft will be left after each float the two sizes are: 30 ft. and 15 ft.
 

A: the parade must be at least 150 ft long, but less than 200 ft long. what combinations of large and small floats are possible?

B: large floats cost 600$ to operate. Small floats cost 300$ to operate. The town has a budget of 2500$ to operate floats. how does this change your answer to part(A)? What combinations of large and small floats are possible?