You have a 20 ounce bottle of juice. you pour out 1/4 of the bootle to share with a friend. if you pour out 3 ounces for yourself, wheat fraction of the 20 ounces will be left in the bottle?

Well, think about it

1/4 of the 20 oz bottle is 5 ounces

So you gave 5 ounces to a friend

Then, you took 3 ounces for yourself

So 5 ounces + 3 ounces = 8 ounces

You used 8 ounces

So 20-8=12

The fraction would be 12/20

And if you simliply it, you get 3/5

You have 3/5 oz of juice or soda left on that bottle

2020 - 5/20 = 15/20 This is the amount that you poured to your friend

15/20 - 3/20 = 12/20 This is the amount that you drank

12 ounces is what is left