word problen

Question

Matt plans to put concrete on a rectangular portion of his driveway. The portion is 8 feet long and 4 inches high. The price of concrete is $98 per cubic yard. The total cost of the concrete Matt needs is $58.07. Which of the following is closest to the width of the portion of the driveway on which Matt plans to put concrete?

Answer 1

A cubic yard is 3 ft x 3 ft x 3 ft = 27 ft³

 

8w(1/3) = 8w/3 ft²

 

(8w/3)/27 = (8w/3)(1/27) = 8w/81 yd³

 

98(8w/81) = 58.07

8w/81 = 58.07/98

8w = (58.07/98)(81)

8w = 48

w = 6 ft