Simplify.

a) [[$ \displaystyle\frac {x} {2} : \displaystyle\frac {3} {x} $]]

b) [[$ \displaystyle\frac {1} {y} : \displaystyle\frac {5} {4} $]]

c) [[$ \displaystyle\frac {8} {y} : \displaystyle\frac {5} {x} $]]

d) [[$ \displaystyle\frac {x} {9} : 3 $]]

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Solution