Ответ:

  1. 325 − (15 + x) = 147; 310 − x = 147; x = 163.
  2. 245 + (3y + 12) = 605; 3y + 257 = 605; 3y = 348; y = 116.
  3. 2032 : (y − 15) = 16; y − 15 = 2032 : 16 = 127; y = 142.