B=90
I think this is the answer
        
             
        
        
        
Answer:
Brainly user is your name..ok..then
Step-by-step explanation:
 
        
             
        
        
        
Let d = # of dimes
Let q = # of quarters
equation #1: number of coins
     d + q = 1234
equation #2: value of coins
     0.10d + 0.25q = 290.05
Solve #1 for d: 
     d=1234-q
Sub #1 into #2 and solve for q:
     0.10d + 0.25q = 290.05
     0.10(1234-q) + 0.25q = 290.05
     123.4 - 0.10q + 0.25q = 290.05
     0.15q =  166.65
     q = 1111
Now go back to d=1234-q and sub in 1111 for q to find d:
     d = 1234 - 1111
     d = 123
1111 quarters and 123 dimes.
     
 
        
             
        
        
        
Answer:
Aren't you just suppose to multiple the 24 and 20 to get 480
 
        
                    
             
        
        
        
Yes, I think I’m not sure correct me if I’m wrong .