Yes it can, if you divide 160 by 8 you get 20, so 160 over 8 can be simplifed to 20 over 1. Normally expressed as 1 over 20 or 1/20.
It is 1.
No but as a decimal 9/20 is equivalent to 0.45
4/20 = 1/5 simplified
No.
7/20
8/40 = 1/5
Yes.
Yes.
One over ten.
43/360
It is already simplified.