Verified Answer :

alexak

3/4 - 1/5
0.75 - 0.2
0.55

Answer: 0.55 or 11/20

You can always convert this to decimal form which I prefer:
3/4 = .75
1/5 = .2
.75 - .2= 0.55
 or in fraction form
11/20
I hope this helps