Hi!
We know that Mr. Abraham’s wife is 6 years younger than him, which is 36-6, which means his wife is 30 years old. 
We also know that Mr A’s son is 24 years younger than his wife, which is 30-24, which is 6.
As of right now, we now know that:
Mr. A is 36
Mr. A’s wife is 30
Mr. A’s son is 6
It’s asking for the ratio of Him:Wife:Son, so 36:30:6. 
BUT, it’s asking for simplest form, so divide each of those numbers by 6.
Your answer is: 6:5:1
        
             
        
        
        
Answer:
2 or 4
Step-by-step explanation:
Since I do not quite understand what you mean by X X, I could think of two answers. If you are doing 5 times X=20, then X = 4, but if you are trying to do 5 times x times x, then x=2.
 
        
             
        
        
        
Answer:
f < 4
Step-by-step explanation:
3f + 9 < 21
21 - 9 = 12
12 / 3 = 4
 
        
                    
             
        
        
        
I'm kind of thrown off for that negative sign, but I try it out in the one that makes sense is this one [ https://gyazo.com/192a76e70d2d46979691cabbf06e6c85 ] If you can better of explain where the negative sign will be great. Hope I helped. 
        
             
        
        
        
Answer:
4 
Step-by-step explanation: