To find the total amount of change we need to combine the total cost of everything first and then subtract that from 20!
$ 1.22+ $ 1.48+ $ 7.98+$ 2.79 = $ 13.47
$ 20.00 - $ 13.47 = $ 6.53
The answer to question is that she will recieve $6.53 in change if she pays with a $20 bill. If you need anymore clarification feel free to ask! Hope this helps.
The ratio is (saturated fat) : (total fat) -----
6 grams : 9 grams -----
Divide both sides by 3 -----
6/3 grams : 9/3 grams -----
2 grams : 3 grams -----
2:3 is the ratio -----
You can also represent it in fraction form : 2/3