How I can get the real data type result instead of integer data type?

In a query, there is something like

order by count(id)/age

where both id and age are the integer data type.

From a query result, I believe the operation count(id)/age yields a integer. I need it in real data type. After
searchingthe online document, I haven't found any related information. Can someone help me out on this problem, please. 

Thanks,

w

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