a)[tex]\frac{45}{28} = 1\frac{17}{28}[/tex]
b) [tex]\frac{27}{10} * \frac{7}{9} = \frac{21}{10} = 2\frac{1}{10}[/tex]
c) [tex]\frac{15}{4} * \frac{8}{15} = 2[/tex]
