If there are five transactions on $12/1,$ four transactions on $12/2$ and nine transactions on $12/3,$ what is the proportion of the transactions that occur during the first three days of December took place on $12/1?$

If there are five transactions on $12/1,$ four transactions on $12/2$ and nine transactions on $12/3,$ what is the proportion of the transactions that occur during the first three days of December took place on $12/1?$

$=5-$: $18$

$=5-$: $12$

$=18-$: $5$

$=12-$: $5$

$=5-$: $9$

$=9-$: $5$