fraction: 320/780 or 16/39
78 out of 780 as a fraction = 78/780 or 1/10
780 equally divisible by both 3 and 5. 320 by 5 not by 3
320 out of 400 as a fraction is 320/400. In simplest form it is 4/5.
320% = 320/100 = 16/5
320 is an integer, not a fraction. There is not really a sensible way of writing it as a fraction. However, if you must, you can use (320*k)/k where k is any non-zero integer as an equivalent fraction.
20/320 = 1/16
320/1000 or 8/25
-104/320 = -13/40
11/13
1/10
1/320; one mile is 320 rods.
20