SOLUTION: At The Old Home Fill'er Up and Keep on a-Truckin' Cafe, Mavis mixes two different types of coffee beans to produce a house blend. The first type costs $4 per pound and the second c

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Question 968340: At The Old Home Fill'er Up and Keep on a-Truckin' Cafe, Mavis mixes two different types of coffee beans to produce a house blend. The first type costs $4 per pound and the second costs $9 per pound. How much of each type does Mavis use to make 75 pounds of a blend which costs $7 per pound? (If the system is dependent assign the free variable the parameter t.)

$4 per lb coffee
$9 per lb coffee
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let p be how many pounds of the cheaper coffee to use.
75-p is how many pounds of the expensive coffee to use.

%284p%2B9%2875-p%29%29%2F75=7;
That could be arranged into two equations and two variables if you prefer, but the two variables were pre-handled here and are not really needed. Just solve for p.