Let's draw the 7ft by 6ft wall that is being painted by Frank and Ryan.
If Frank paints 14 square feet of the wall, we can say that Frank painted two rows of 7ft wide. See illustration below.
The darker horizontal line is the straight line that divides the wall into two sections.
So, the orange part is the section where Frank paints and the blank (white) part is the part of the wall that Ryan paints.
