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A small box (s ) contains 8 donuts and a large box (l ) contains 12 donuts. Sam bought 10 boxes of donuts containing a combined total of 108 donuts. Identify each equation that correctly describes the donut purchase.
1) s + l = 12
2) s + l = 10
3) 10s + 8l = 12
4) 12s + 8l = 108
5) 8s + 12l = 108
6) s + l = 108