Tim and Judy mix two kinds of feed for pedigreed dogs. they wish to make 28 pounds of feed worth $0.19 per pound by mixing one kind worth $0.13 per pound with another worth $0.29 per pound. How many pounds of the cheaper kind should they use in the mix?

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so we have two unknowns, and hence we need two equations to solve this

so the first one is that (.13*x + .29*y)/28 = .19

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