1 fifth
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
one fifth
We convert it into thirty-fifths. That gives 15 thirty-fifths minus 14 thirty-fifths which is one thirty fifth.
1 and 4 fifths.
One whole minus two fifths is three fifths.
3.4 or three and two fifths
Assuming that you mean "fifths", the answer is three fifths.
one fifth
Eight Fifths
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
1 2/5
2/3