Linda makes and sells necklaces at craft fairs. At her most recent fair she sold 4 necklaces and 8 rings for a total of $80. If each necklace costs $12, how much does each ring cost?
Let’s use r for the cost of each necklace
4*12+8*r=80
48+8*r=80
8*r=80-48=32
8r=32
r=<<4=4>>4 dollars for each ring
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