Now the quilt measures 1.5 inches by 3inches. This means that the length of the quilt is 3 inches and the breadth is 1.5 inches, considering the quilt to be a rectangle. They are asking us the length of the quilt she will need measured in "feet" and not in inches.
Since she needs 20 pieces, the length required is 3 inches x 20 = 60 inches.
converting 60 inches to feet becomes 60/12 = 5 feet. Because 12 inches make 1 feet. Therefore, the answer is 60/12 = 5 feet.