so we have to divide 23 into 9:
[tex] \frac{23}{9} [/tex]
this is already the answer, there will be [tex] \frac{23}{9} [/tex] in each bin.
to express it in a mixed fraction we see how many times 9 "fits" into 23: it's 2 times (2*9=18) and 5 is left (23-18=5)
so the mixed fraction will be
[tex]2 \frac{5}{9} [/tex]