Answer:
a:d=7:9
Step-by-step explanation:
We have a system with 3 equation:

If we multiply all of these equations, then we have:

If we simplify this fraction dividing by 9, then:

Therefore, a:d=7:9
 
        
             
        
        
        
2/3 because you flip 3 coins and you want to get al least 2 heads!
        
             
        
        
        
Answer:
20
Step-by-step explanation:
if their ages total is 60 and gabrielle's is two times mikhail's age, that means that Mikhail would be twenty because their age times 2 would be 40 and 40 plus 20 is 60.
 
        
                    
             
        
        
        
Answer:
Hehe did did dodndosnsod fofmfomdixnsis
Step-by-step explanation:
Nsisndidndisnsidnsi293883 ownsie
 
        
                    
             
        
        
        
What do you mean by that?