There is a 12-ft fence on one side of a rectangular garden. The gardener has 44 ft of fencing to enclose the other three sides. What is the length of the garden's longer dimension?
The longer sides are 16 ft.
Rectangles have four sides, and sides opposite each other are always the same length.
You know one side is 12 feet, so you know there is another side that is also 12 feet.
There are 32 feet of fencing to split between the two remaining sides, which means each one of them is 16 feet. long.