How long will it take her to paint a room that has 720 square feet of wall space?

Question

Ysidra paints a room that has 400 square feet of wall space in 2/1/2 hours.

Answer 1

Make a ratio.

 

400/2.5 = 720/x

 

400x = 720 x 2.5

 

x = 4.5