SOLUTION: Aconcrete worker is pouring the footer for a rectangular house that is 60 feet long and 40 feet wide. The trench dug around the out side edge of the house is 18 inches wide and 30

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Question 298973: Aconcrete worker is pouring the footer for a rectangular house that is 60 feet long and 40 feet wide. The trench dug around the out side edge of the house is 18 inches wide and 30 inches deep. If concrete costs $64 a cubic yard, how much will the concrete for the footer cost? Round to the nearest whole cubic yard and the nearest whole dollar.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A concrete worker is pouring the footer for a rectangular house that is 60 feet long and 40 feet wide.
The trench dug around the out side edge of the house is 18 inches wide and 30 inches deep.
If concrete costs $64 a cubic yard, how much will the concrete for the footer cost?
Round to the nearest whole cubic yard and the nearest whole dollar.
:
18" wide will subtract 3' from the outer dimensions
30" = 2.5 ft deep
:
Find the area of the concrete footer
total area - area inside the footer
(60*40) - (57*37) = 291 sq ft
:
Find the volume
291 * 2.5 = 727.5 cu/ft
:
convert to cu/yds
727.5%2F27 = 26.944 ~ 27 cu/yds
:
Find the cost
27 * 64 = $1728 worth of concrete