The difference between 907 sixteens and 856 twelves

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Find two consexutive odd integers such that the sum of their square is 650

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost