Problema Solution
A new sidewalk will be 6 feet wide, 140 feet long, and filled to a depth of 6 inches with concrete. How many cubic yards of concrete are needed?
Answer provided by our tutors
1 ft = 12 in
6 ft = 6*12 = 72 in is the width
140 ft = 140*12 = 1,680 in is the length
6 in is the depth
the volume V = width*length*depth
V = 72*1680*6
V = 725,760 in^3
1 yd = 36 in
1 yd^3 = 36^3 in^3
1 yd^3 = 46,656 in^3
725,760 in^3 = 725,760/46,656 yd ^3 = 15.56 yd^3
15.56 cubic yards of concrete are needed.