Question

Ali measures the rectangular area of his driveway he wants to fill with gravel to be 4 yards by 50 yards. He orders 80 cubic yards of gravel.
a) How deep will the layer of gravel be on the driveway
b) If Ali had ordered 20 cubic yards more gravel , how much deeper would gravel be?
I’m not sure how to do this please help thank you.

Answer 1

length * width = area
length * width * height = volume
That means that area * height = volume
here
area = 50 * 4 = 200 square yards
height = volume / area = 80/200 = 0.40 yards (which is about 14 1/2 inches)
If he used 100 cubic yards then
new height =100/200 = 0.50 yards which is 1/10 yard deeper (around 4 inches deeper for total depth of .5*36 = 18 inches)

Answer 2

Thank you so much anonymous for your help with my math question . I really appreciate it .