william wishes to carpet his rectangular5 patio, whose dimensions are 21 feet by 18 feet. How much will it cost William to cover his patio if the carpet costs $4.95 per square yard?

cost= 21/3*18/3*4.95

To find the cost of carpeting William's patio, we first need to calculate the area of the patio in square feet. To do this, we multiply the length (21 feet) by the width (18 feet):

Area = length * width
Area = 21 feet * 18 feet
Area = 378 square feet

Now, we need to convert the area from square feet to square yards. Since there are 9 square feet in 1 square yard, we divide the area in square feet by 9:

Area in square yards = Area in square feet / 9
Area in square yards = 378 square feet / 9
Area in square yards = 42 square yards

Next, we can calculate the cost of carpeting the patio. The carpet costs $4.95 per square yard, so we multiply the area in square yards by the cost per square yard:

Cost = Area in square yards * Cost per square yard
Cost = 42 square yards * $4.95 per square yard
Cost = $207.90

Therefore, it will cost William $207.90 to cover his patio with the carpet that costs $4.95 per square yard.