Algebra
posted by Nola .
A grocery store makes a 20pound mixture of almonds and cashew nuts. The store charges $4 per pound for almonds and $5.50 per pound for cashews. The total value of the mixture is $92. Write a system to find how many pounds of each type of nut are in the mixture.

4 a + 5.5 c = 92
a + c = 20
4 a + 5.5 c = 92
4 a + 4 c = 80
subtract
0 + 1.5 c = 12
c = 8
etc
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