[tex]a) \ \frac{3}{4} = \frac{3\cdot5}{20} = \frac{15}{20}\\\\b) \ \frac{12}{15} = \frac{12\cdot4}{60} = \frac{48}{60}\\\\c) \ \frac{6}{7} = \frac{6\cdot8}{56} =\frac{48}{56}[/tex]
[tex]d) \ 2\frac{5}{7} = 2\frac{5\cdot5}{35} =2\frac{25}{35}\\\\e) \ 6\frac{7}{9} = 6\frac{7\cdot7}{63}=6\frac{49}{63}\\\\f) \ 3\frac{5}{6} = 3\frac{5\cdot5}{30} = 3\frac{25}{30}[/tex]
