1. 42 : 7 = 6
2. 6 * 3 = 18
3. 24 : 3 = 8
4. 9 * 3 = 27
5. 18 + 2 = 20
6. 20 + 8 = 28
7. 28 - 7 = 21
8. 21 + 27 = 48
Ответ: 48