Answer: 63.39 ft
Step-by-step explanation:
 
        
                    
             
        
        
        
Tifania’s work is correct because the formula for circumference is 2(3.14)(r)
        
             
        
        
        
Larger by 3 means that the legnths of the sides are larger by 3 times
so we have a cube that has area of 400
surface area=legnth times width times 6 since it is a cube and legnth=width
so 
SA=w^2 times 6
6w^2=400
divide by 6
w^2=200/3
square root both sides
w=√(200/3)
so w is 3 times larger
(3w)^2 times 6 is new area
w=√(200/3)
(3√(200/3))^2 times 6=9(200/3) times 6=600 times 6=3600 
answer is 3600 ml^2