Let x be the amount of the solution containing 10% of the chemical. Then, the solution with 40% chemical becomes 10 - x. The equation for balancing the chemical content of the solution is, 
 0.10x + 0.40(10 - x) = 0.25(10)
The value of x is 5. Hence, the druggist should mix 5 ounces of each. There are 2.5 ounces of chemical in the final mixture.
 
        
                    
             
        
        
        
14 students play a brass instrument :)
        
                    
             
        
        
        
Let the number be x
3x - 5 = 14
3x = 19
X = 6 1/3 or 6.333333...
        
                    
             
        
        
        
Answer:
2
Step-by-step explanation:
Since x=-2
-2+3y=4
Add 2 on both sides
3y=6
Divide 3 on both sides
y=2
 
        
                    
             
        
        
        
And that is how you get your answer