How much of a perfume that sells for 15 per ounce should be

How much of a perfume that sells for $15 per ounce should be mixed with a perfume that sells for $35 per ounce to make a 3 oz bottle of perfume that can be sold for $63? Amount of $15 perfume = ? oz

Thanks

Solution

let x oz of $15 perfume and 3-x oz of $35 perfurm are mixed

Then,
x*15 + (3-x)*35 = 63
15*x -35*x +105 = 63
20*x = 42
x = 2.1

Answer:
Amount of $15 perfume = 2.1 oz