Question

Kevin plans to put concrete on a rectangular portion of his driveway. The portion is 10 feet long and 3 inches high. The price of concrete is $98 per cubic yard. The total cost of the concrete Kevin needs is $72.59. Which of the following is closest to the width of the portion of the driveway on which Kevin plans to put concrete?

Answer 1

We are given the dimensions 10 feet length and 3 inches height. The volume of the rectangular portion is equal to $72.59 / $98 per cubic yard that is equal to 0.74 cubic yard. This is equal to 19.98 cubic feet. This means the width of the portion is equal to 8 feet. 

Hope this helps

Answer 2

Answer:

0.3 feet

Step-by-step explanation:

Let, "w" be the required width of the rectangular portion and "x" be the volume of rectangular portion.

Since, 3 inches = 0.25 feet,

$x = (w).(10).(0.25) = 2.5w$

since he pays $72.59, he does have:

$\frac{98}{feet^3} = \frac{72.59}{x}$

which is the same as

$\frac{feet^3}{98} = \frac{x}{72.59}$

and so we get

$x yards = \frac{feet^3.(72.59)}{98}$

he has used concrete equalling , and thus the volume he will get in $72.59 is:

$x = \frac{72.59}{98} = 0.7407$ ≈ $0.75 feet^3$

Since, we wanted to find out the width, therefore:

$0.75 = 2.5w$

$w = \frac{0.75}{2.5}$

$w = 0.3 feet$

So, the required width is 0.3 feet.