The coffee producer uses columbian and brazilian coffee beans to make two blends, robust and mild. The pound of robust blend needs 12 ounces of colombian beans and four ounces of brazilian beans. A pound of mild blend needs six ounces of colombian beans and ten ounces of brazilian beans. Coffee is shipped in 101-pound burlap bags. Company has 51 bags of colombian beans and 31 bags of brazilian beans on hand. How many pounds of every blend must they produce to use all available beans?