a vending machine has twice as many quarters in it as dollar bills. if the quarters and dollar bills have a combined value os $9
6.00, how many quarters are in the vending machine?
2 answers:
There are 128 quarters in the vending machine
D = dollars. Q = 2D
<span>0.25(2D) + D = 96 </span>
<span>0.5D + D = 96 </span>
<span>1.5D = 96 </span>
<span>D= 64 dollars </span>
<span>therefore, there's 64 x 2, or 128 quarters in the machine</span>
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