Answer: 1.1
Step-by-step explanation:
If Sam buys 14 water bottles, he will have spent 18.9, so when you subtract 20 (the limit) from 18.9 (how much money he'll spend on the water bottles) you get 1.1
 
        
             
        
        
        
So what you got to do is divide them perseay use a calculator for the first one 2/15 what would that be in a decimal 0.13333333333333 what ever on has 0.13333333  or something else repeating that is the one that you will circle 11/20=0.55   17/40 =0.425 1/2=0.5 so you answer would be 2/15
hope this helped