Answer :

21/5
five goes into twenty-one 4 times with a remainder of 1
21/5=4 1/5
8 4/7
8*7=56
56+4=60
8 4/7=60/7
divide the numerator by the denominator then simplify so for example
[tex] \frac{75}{6} [/tex]
you will divide 75 by 6 6 does not fit into 75 equally but thats okay that leads us to the mixed number so 6 fits into 75 only 12 times and there will be a remainder of 3
so the answer will be 
[tex]12 \frac{3}{6} [/tex]
the fraction simplified is 
[tex] 12\frac{1}{2} [/tex]
[tex] \frac{75}{6} [/tex] = [tex]12 \frac{1}{2} [/tex]
i just turned a improper fraction into a mixed number