F.6 Maths Linear programming?

Question:

Joseph wants to decorate a room with blue wallpaper and white wallpaper.
The area of the walls is 120m^2. A roll of blue wallpaper can cover 4m^2 of area while
a roll of white wallpaper can cover 3m^2 of area.
Let x = number of rolls of blue wallpaper
y = number of rolls of white wallpaper

Then the inequality should be 4x+3y≥120 or 4x+3y≤120?

For the question that "put cans of drink into two kinds of boxes",
it is very obviously, but how about in this question?

Please help,thank you!!