84/5−5 1/10 3 3/10 3 3/5 3 5/5 3 7/10

8 4/5= 8 8/10

8 8/10- 5 1/10= 3 7/10

The 4th option is correct.
Hope this helps!

First, you have to find the common denominator for 4/5 and 1/10.
                                   
                          4/5= 8/10           1/10=1/10
then you subtract 5 from 8. 8-5= 3

Now you subtract 8/10 from 1/10. 8/10 - 1/10= 7/10 
                                     Your 3 7/10