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Math·Problem-Solving and Data Analysis·Ratios, rates, proportional relationships, and units

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A raised garden is in the shape of a right rectangular prism. Its base has a width of 3 feet and a length of 21 feet, and it will be filled 24 inches high with topsoil. The total cost of the topsoil needed to fill the garden to this height is 154 dollars. What is the unit cost, in dollars per cubic yard, for the topsoil?

$1\text{ yard}=3\text{ feet};1\text{ foot}=12\text{ inches}$

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