I think maybe the second one I’m not fully sure but I hope this might help
Answer:
18 books done and 6 books left
Step-by-step explanation:
24 *3/4 = 18
Answer:
The third one or the first one
Step-by-step explanation:
Can't be +4 or -4
Given:
Number of times Jenna feeds her cat = 2
Cat food each time 
Number of days = 5
Number of cans she bought = 8
To find:
Did Jenna buy enough cat food.
Solution:
Required food for each time 
Jenna feeds her cat twice a day.
Required food for a day 

Required food for 5 days 


Since, 7.5 cans < 8 cans, therefore, Jenna buy enough cat food for her cat.