An animal breeder can buy four types of food for Vietnamese pot-bellied pigs. Each case of Brand A contains 25 units of fiber, 30 units of protein, and 30 units of fat. Each case of Brand B contains 100 units of fiber, 90 units of protein, and 80 units of fat. Each case of Brand C contains 175 units of fiber, 150 units of protein, and 140 units of fat. Each case of Brand D contains 300 units of fiber, 270 units of protein, and 230 units of fat. How many cases of each brand should the breeder mix together to obtain a food that provides 2900 units of fiber, 2550 units of protein, and 2320 units of fat? Let x represent the number of cases of Brand A, y represent the number of cases of Brand B, z represent the number of cases of Brand C, and w represent be the number of cases of Brand D. There are four ways in which the breeder can mix brands to obtain a food that provides 2900 units of fiber, 2550 units of protein, and 2320 units of fat. If w= 0, the solution is ( 0).

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