What's your favorite food or drink?
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
So, on Monday, Tuesday, and Wednesday, he mowed: 

yards, respectively. 
To determine how many yards he mowed in the three days, simply add the three expressions. Thus: 

Combine like terms: 

Add or subtract: 

And it cannot be simplified further :)
 
        
             
        
        
        
First work out the parenthesis.  Division goes first so 0.12/0.3 = 0.4. 0.8-0.4-0.4. (Sorry for so many dots o_o) 4.92 divided by 0.4 equals 12.3