yolanda sells two grades of dog food. type a sells for 75 cents per pound and type b sells for 52 cents per pound. how many pounds of each must be used to produce 600 pounds of mixture selling for 60 cents per pound?

Answer 1

if a lbs are type a, then the rest (600-a) are type b. So, add up the parts and make sure it matches the whole:

75a + 52(600-a) = 60*600