There are 20 dogs at the park.2/10 of the dogs had ribbons.what fraction of the dogs did not have ribbons

Answer 1

20 * 2/10 = 40/10 = 4 dogs have ribbons...

1 - 2/10 = 10/10 - 2/10 = 8/10 of the dogs do not have ribbons...

8/10 * 20 = 160/10 = 16 dogs have ribbons...

8/10 = 4/5 of the dogs do not have ribbons..

and

16/20 = 8/10 = 4/5

4/5 of the dogs do not have ribbons