SOLUTION: Raisins sell for $3.50 per pound, and granola sells for $5.90 per pound. Terri bought some raisins and some granola. The total weight was 2.1 pounds and cost $8.79. Let r repres

Question 788188: Raisins sell for $3.50 per pound, and granola sells for $5.90 per pound. Terri bought some raisins and some granola. The total weight was 2.1 pounds and cost $8.79.
Let r represent the number of pounds of raisins Terri purchased.

Which expression represents the number of pounds of granola she purchased?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
This is a mixture problem. The prices are like concentration in units dollars per pound.

r = how many raisins
g = how many granola
(both as pounds)

But you do not need to show as concentration or cost per pound; you just need this:

You also need

THE REST OF THE PROCESS:
You are asked for the pounds of raisins, so solve the system for r. First solve one equation for g, and substitute this expression for g in the other equation; and from this, solve for r.
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