Question

Kevin plans to put concrete on a rectangular portion of his driveway. The portion is 10ft long and 3 inches high the price of concrete is $98 per cubic yard which of the following is closest to the width of the portion of driveway.3ft,6ft,8ft, or 10 ft

Answer 1

The total cost of the concrete was $72.59

Answer 2

be careful with units on this problem

since it gives us the cost of the concrete, as well as the price per cubic yard, we can find the # of cubic yards of concrete by dividing:

(total cost of the concrete) / (cost per cubic yard). this is the volume of the concrete in yards. set aside this value as "V"

Answer 3

now, V = L*W*H, where L = length, W = width, H = height

our volume is in yards now, so we must also convert our L W and H into yards as well.

L = 10 feet ---> divide this by 3 to get yards
H = 3 inches ---> divide this by 12 to get feet ---> divide again by 3 to get yards

once you have your new L and H values in yards, you can plug in V, L, and H into the formula to get W

now, since the answer choices for width are in feet, multiply by 3 to get feet