You need to know how much the state Park camping cost, I think...
        
             
        
        
        
I believe B . Because it seems equivalent
        
             
        
        
        
Hope this helps!! Ccccccccffffff
 
 
        
        
        
Answer:
33 1/3 L of the 40% solution, 16 2/3 L of the 25% solution
Step-by-step explanation:
Set up two equations...
Let x represent the number of Liters of the 40% solution
Let y represent the number of Liters of the 25% solution
We need 50 liters total, so
x + y = 50
and we need the 50 L to be 35% solution, so
0.4x = 0.25y =  0.35(50)  
Solve the first equation for one variable...
x = 50 - y             (subtract y from both sides in equation 1)
Now substitute that value into the second equation...
0.4(50 - y) + 0.25y = 17.5      (x becomes 50 - y, 0.35(50) = 17.5)
Now solve for y...
20 - 0.4y + 0.25y = 17.5
   -0.15y = -2.5
       y = 16.66666667
 
         y = 16 2/3 L
So we need to plug that into the first equation to find 'x'
x + 16 2/3 = 50
x = 50 - 16 2/3
x = 33 1/3