50+35+30-70= 105-70=35'ответ'
1. (13 * 12500) / 100 = 1625
12500 - 1625 = 10875
2. (27 * 100) / 30 = 90
3. (10 * 40) / 100 = 4
40 + 4 = 44
900 : 44 = 20