combine candy at 1.80lb and nuts at 1.20lb. you need 20lb of the mixture that you can sell for 1.56lb. how many pounds of candy and how many pounds of nuts do you need

combine candy that cost 1.80lb with nuts that cost 1.20lb. you need to make a 20lb mixture that you can sell for 1.56lb. how many lbs of candy and how many pounds of nuts will you need?