Solve the problem.Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 31 pounds of feed worth  per pound by mixing one kind worth  per pound with another worth  per pound. How many pounds of the cheaper kind should they use in the mix? (Round to the nearest whole number)

A. 15 pounds
B. 16 pounds
C. 21 pounds
D. 17 pounds


Answer: A

Mathematics

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