Suppose $S$ cans of soda can be purchased from a vending machine for $Q$ quarters. Which of the following expressions describes the number of cans of soda that can be purchased for $D$ dollars, where 1 dollar is worth 4 quarters?

$\dfrac{4DQ}{S}$
$\dfrac{4DS}{Q}$
$\dfrac{DS}{4Q}$
$\dfrac{4Q}{DS}$
$\dfrac{DQ}{4S}$

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$Q$ quarters $=\dfrac Q4$ dollars. $\dfrac Q4$ dollars get $S$ cans of soda. Therefore the price of one can of soda is $\dfrac {\frac Q4}S = \dfrac Q{4S}$ . And $D$ dollars can buy $\dfrac D{\frac Q{4S}} = \boxed{\dfrac {4DS}Q}$ .