cost=7d
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12.99 x 3 = 38.97 Price of CD x number of CDs = Cost of three CDs
432
Since there isn't enough data to actually find the number of Cds miriam has, we must simply write and expression for the number of Cds she has. Since Kayla has x Cds and Miriam has seven less;Miriam has x-7 Cds.
its more than 45%....
You didn't provide enough information to answer the question. You could buy 4 of the first or 8 of the second, or three different mixes. Which one you want depends on whether you value having the maximum total number of CDs, or having as many matched pairs as possible, etc.