Step-by-step explanation:
[tex] \frac{3}{d} = \frac{12}{20} \\d \times 12 = 3 \times 20 \\ 12d = 60 \\ d = \frac{60}{12} \\ d = 5 \\ \\ \frac{7 }{8} = \frac{m}{48} \\ 8 \times m = 7 \times 48 \\ m = \frac{7 \times 48}{8} \\ m = 42[/tex]
