A store is selling two mixtures of coffee beans in one-pound bags. The first mixture has ounces of Sumatra combined with ounces of Celebes Kalossi, and costs . The second mixture has ounces of Sumatra and ounces of Celebes Kalossi, and costs . How much does one ounce of Sumatra and one ounce of Celebes Kalossi cost?

for Sumatra and for Celebes Kalossi

for Sumatra and for Celebes Kalossi

for Sumatra and for Celebes Kalossi

There is no solution.