Respuesta :

The sum of both quantities is always equal to 400.

Then:

x y x+y

0 400 0 + 400 = 400

75 325 75 + 325 = 400

218 272 218 + 272 = 400

319 81 319 + 81 = 400

396 4 396 + 4 = 400

Answer: The sum of x and y is always equal to 400.