I have no Idea how to set this up to work. Please help!

Question

Nutrition one serving of campbell's soup companies campbell's pork and bean contains 5 grams of proton and 21 grams of carbohydrates. a typical slice of lite rye bread contains 4 grams of proton and 12 grams of carbohydrates.

(a)i am planing a meal of beans on tost and wish to have it supplied one-third of the U.S. RDA for protein and 80 grams of carbohydrates how should I prepare my meal.

(b)Is it possible to have my meal supply the same amount of protein as in part (a) but only 60 grams of carbohydrates