A rectangular floor is 21 feet long and 12 feet wide. What is the area of the floor in square yards?

To solve this problem, we first need to convert the measurements to yards.

There are 3 feet in a yard, so the length of the floor in yards is 21/3 = 7 yards.

Similarly, the width of the floor in yards is 12/3 = 4 yards.

Therefore, the area of the floor is 7 yards * 4 yards = <<7*4=28>>28 square yards.