A health food store sells oatmeal for $3.60 per pound and bran flakes for $4.80 per pound. How many pounds of each should be used to get a mixture of 30 pounds that sells for $4.00 a pound?
Basically this is a straight line graph Plotting cost against content of Bran Flakes.
At 0% Bran Flakes the mix is 100% Oatmeal
At 100% Bran Flakes the mix is 0% Oatmeal
The gradient of part of the graph is the same as the gradient of all of the graph.
Turning the whole thing upside down
Multiply both sides by
The final mix is to have the weight of