All you have to do is multiply the l * w = Area
When you look at 26 ft and 15 ft, 21 ft and 10 ft, 29 ft and 18 ft, you'd know it wouldn't work since it's over 180.
So the dimensions of the ceiling are l = 20 ft; w = 9 ft
Basically make a plot that has no correlation (the points are all random and don't mean anything)
She can make two complete doormats. 48 inches converts to 4 ft. 4 can go into 10 twice, with two feet remaining