Answer:  a:b:c:d = 16:24:30:40
You can also divide the ratio by 2 because all terms have 2 in common. Which would be  a:b:c:d = 8:12:15:20
 
        
             
        
        
        
Once upon a time there was a guy named Jeff. he went to a new school where he moved. so he was all by himself with no friends at all.. so then he met this guy named Zac so it was 1+1=2. and they were bff so they lived happily ever after together being bffs
        
             
        
        
        
I need the sign between the (2/5)x and the 9
        
             
        
        
        
Answer:
a) 1/2
b) 6/100
c)1/4
I'll explain how I got these answers later.