g = grau
o = orz
p = porumb
g + o + p = 968
o = g/2 + 19
p = o + 58 = g/2 + 19 + 58 = g/2 + 77
g + g/2 +19 + g/2 + 77 = 968
g + g/2 +g/2 + 96 = 968
g + g/2 + g/2 = 872
2g = 872
g = 436
o = g/2 + 19 = 436/2 + 19 = 218 + 19 = 237
p = o + 58 = 237 + 58 = 295
436 t grau, 237 t orz si 295 t porumb