Alright, lets get started.
The ages of all four sisters will be = x, x+2, x+4, x+6
As per given in question, two times of youngest sister age exceeds the oldest sister age by 30 means 

Simplifying the equation



So this is the age of youngest sister.
So, age of oldest sister will be 
Hene the age of oldest sister is 42 years.   :  Answer
Hope it will help :)
 
        
                    
             
        
        
        
1:4 tennis to soccer---- 1 =5 so 4 = 5x4=20 students on the soccer team
1:2 Soccer to football ----- 1=20 so 2= 20x2= 40 students on the football team.
there are 40! 
let me know if you get it right
        
                    
             
        
        
        
Please comment on this so I can see the full question
        
             
        
        
        
Answer:
PS = 10 
Step-by-step explanation: