Final answer:
To find the amount of concrete needed, convert the patio's dimensions from feet and inches to yards, then multiply length by width by depth. Jackie needs approximately 5.67 cubic yards of concrete for her 15' by 20' patio with a depth of 6".
Step-by-step explanation:
To calculate the amount of concrete needed for Jackie's patio that is 15' wide by 20' long and 6" deep, we first convert the dimensions to yards since concrete is typically sold by the cubic yard. The width is 15 feet, which is 5 yards (because there are 3 feet in a yard). The length is 20 feet, which is approximately 6.67 yards. The depth is 6 inches, which is 0.5 feet or approximately 0.17 yards (there are 36 inches in a yard, so 6 inches is 6/36 or 1/6th of a yard).
Now we multiply the three dimensions together to get the volume in cubic yards: volume = width x length x depth. Plugging in the numbers: volume = 5 yards x 6.67 yards x 0.17 yards. This equals approximately 5.67 cubic yards of concrete required for the patio.