Return to Answer

Mathematica, 20 bytes

{⌊#/#2⌋,Mod@##}&

Only marginally longer than the ridiculously named built-in QuotientRemainder.

Mathematica, actually has a neat way to apply multiple functions to the same input, but it's three bytes longer:

Through@*{Quotient,Mod}

Mathematica, (削除) 20 (削除ここまで) 18 bytes

⌊#/#2⌋@Mod@##&

Minor abuse of the flexible output rules: the result is given as div[mod], which will remain unevaluated. The individual numbers can be extracted with result[[0]] and result[[1]].

And hey, it's only one byte longer than the ridiculously named built-in QuotientRemainder.

Mathematica, actually has a neat way to apply multiple functions to the same input, but it's three bytes longer:

Through@*{Quotient,Mod}