Question 320910
Find the volume of the dirt that needs to be hauled away.
Then find the number of truckloads to haul the dirt.
Multiply the number of truckloads by cost per truckload to get the total cost.
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Volume
{{{V=42*24*9=9072}}} cubic feet
Convert from cubic feet to cubic yards.
{{{1}}} yd = {{{3}}} ft
{{{1^3}}} yd^3={{{3^3}}} ft^3
{{{1}}} yd^3={{{9}}} ft^3
{{{V=9072/9=1008}}} yd^3
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Each truck holds {{{8}}} yd^3.
So the number of trucks equals total volume divided by truck volume.
{{{N=1008/8=126}}} 
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Each truck cost $5.
{{{Total=5(126)=630}}}
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To remove the dirt, the contractor needs to pay $630.