Answer:
Assuming that a and b are not the hypotenuse then B would be equal to A, so B would equal 25m
Step-by-step explanation:
I hope this is right, you didn't put a picture. 
 
        
             
        
        
        
The LCM of 10 and 14 is 2.
        
                    
             
        
        
        
It would be be because they didn’t distribute the 8n to the 20