[tex]a) \frac{15}{16} * \frac{20}{21} = \frac{25}{28} [/tex]
[tex]b) \frac{12}{25} * \frac{35}{16} = \frac{21}{20} [/tex]
[tex]c) \frac{10}{27} * \frac{18}{35} = \frac{4}{21} [/tex]
[tex]d) \frac{5}{4} *2 \frac{2}{15} = \frac{5}{4} * \frac{32}{15} = \frac{8}{3} [/tex]
[tex]e) \frac{7}{3} *3 \frac{3}{14} = \frac{7}{3} * \frac{45}{14} = \frac{15}{2} [/tex]
[tex]f) \frac{5}{9} *2 \frac{4}{25} = \frac{5}{9} * \frac{54}{25} = \frac{6}{5} [/tex]