In 20 oz of one alloy there are 6 oz of copper, 4 oz of zinc and 10 oz of lead. In 20 oz of a second alloy there are 12 oz of copper, 5 oz of zinc and 3 oz of lead, while in a 20 oz of a third alloy there are 8 oz of copper, 6 oz of zinc and 6 oz of lead. How many ounces of each alloy should be combined to make a new alloy containing 34 oz of copper, 17 oz of zinc and 19 oz of lead?