do you mean this number:
[tex]175 \frac{20}{4} [/tex]?
The we have to simplify the fraction part, since the nominator is bigger than the denominator.
How many denominators fit into the nominator? 20: 4=5
5! so[tex] \frac{20}{4} [/tex] is simply 5 and we can add it to the main number:
175+5=180
