No.
No.
Yes, four fifths is 80% and three fourths would be 75%.
25
2 fourths times four fifths is 2 fifths.
11/20 or 0.55
1 7/20
Yes.
16 11/20
no because 5 fourths is also equivalent to 5.25 and 4 fifths is also equivalent to 0.8. In addition to this, 5 fourths is also 5 pieces out of your pieces (which is greater than one) and 4 fifths is four pieces out of five pieces (which is less than one, also fifths are smaller than fourths).
4.6 is equal.
six and three-fourths
six and eleven twentieths