7 is 1/4 of 28, so 7 is 25% of 28.
The drop from 28 to 7 is a drop of 21.
21 is 3 times 7, so 21 is 3 times 25%.
Answer: It is a 75% decrease.
Answer:
did you make a typo? there is no real solution
Step-by-step explanation:
Getting at least a 80% ( B average) is also good still very close to 90
Step-by-step explanation:



Equating,




Placing it,



1. 20 slices
2. 54 for herself
Hope this helps