SOLUTION: betty prepares a mixture of nuts that has cashews and peanuts in a ratio of 3 to 7. how many pounds of each will she need to make 40 lb of the mixture?

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Question 742503: betty prepares a mixture of nuts that has cashews and peanuts in a ratio of 3 to 7. how many pounds of each will she need to make 40 lb of the mixture?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
c cashews and p peanuts
3%2F7=c%2Fp

c%2Bp=40
Ration makes c=p%283%2F7%29
%283%2F7%29p%2Bp=40
Solve for p