A store has two types of animal feed avalible type A contains 3 pounds of oats and 3 poinds of corn per bag type B contains 1 pound of oats and 7 pounds of corn per bag A famer wabts to combine the two types so that the resulting mixture has at least 18 pounds of oats and at least 54 pounds of corn The store only has 11 bags of type A feed and 12 bags of type B feed in stock type A costs 3 per bag and type B costs 5 per bag how many bags each type should the farmer buy to minimize his cost