Question 1143465
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How many pounds of chocolate costing $20.80 per pound should be mixed with 10 pounds of trail mix costing $3.00 per pound to create a mixture worth $13.38 per pound. 
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H=20.8
L=3
x=unknown pounds chocolate, related to H
Y=10
T=13.38


{{{Hx+3Y=(x+Y)*T}}}

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{{{Hx+LY=Tx+TY}}}

{{{Hx-Tx=TY-LY}}}

{{{(H-T)x=TY-LY}}}

{{{highlight(x=(TY-LY)/(H-T))}}}
Substitute the given values.