Hello there! 
To find which tuna is a better deal, divide the cost by the number of ounces of tuna you are getting to get the cost per ounce.
$0.90/5  = $0.18 per ounce
$2.40/12 = $0.20 per ounce
Since the 5-ounce can of tuna has a cheaper unit rate price, meaning you are getting a better value, makes this the best option. I hope this was helpful and have a great day! :)
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:



Hope I helped!
Best regards! :D
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X=21
let me know if you need to know how to solve it.