[tex]e) \: \: 2 \times 6 + 2 \times 5 + 2 \times 9 \\ 2 \times (6 + 5 + 9) \\ 2 \times 20 = 40 \\ 5 \times 10 + 5 \times 3 + 7 \times 5 \\ 5 \times (10 + 3 + 7) \\ 5 \times 20 = 100 \\ \\ 2 \times 8 + 8 \times 3 + 5 \times 8 \\ 8 \times (2 + 3 + 5) \\ 8 \times 10 = 80[/tex]
