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Two-variable inequalities word problems


Wang Hao wants to spend at most dollar sign, 15 on dairy products. Each liter of goat milk costs dollar sign, 2, point, 40, and each liter of cow's milk costs dollar sign, 1, point, 20.
Write an inequality that represents the number of liters of goat milk left parenthesis, G, right parenthesis and cow's milk left parenthesis, C, right parenthesis Wang Hao can buy on his budget.