23
Let’s start by making the mixed number an improper fraction. To do this you multiply the whole number by the denominator and add the numerator.
4 x 5 + 3 = 23
No we have 23/5 divided by 1/5
We have common denominators but you don’t need them for multiplying and dividing fractions. To discuss fractions you just go across, but there’s a thing. You have to flip the second fraction then you can multiply instead of divide. 
So
23/5 x 5/1 
23 x 5 = 115
5 x 1 = 5 
115/5 
This can be simplified to 23 because 5 divided by 115 is 23. 
Hope this helps