So, the answer is :

B. Solution Z, 1L of 70%








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Compounding question from
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Question:
To make space for new stock, you've been asked to combine 4 bottles of cleaning solution "Z", and then label that bottle with the volume and % concentration. The contents are:

-Bottle 1= 200mL of 75%
-Bottle 2= 300mL of 90%
-Bottle 3= 100mL of 80%
-Bottle 4= 400mL of 50%

-What will you type on the new label?


A. Solution Z, 1L of 78%

B. Solution Z, 1L of 70%

C. Solution Z, 1L of 62%

D. None of the above




How to do this



bottle #1   +   bottle #2   +   bottle #3   +   bottle #4   =   Total
                   
200 (.75)   +   300 (.90)   +   100 (.80)   +   400 (.50)   =   1000 (X)
                   
150
  +  
270
  +  
80
  +  
200
  =   1000X
                   
           
700
  =   1000X
           
   
   
( isolate
for
X )
 
1000
    1000
            
           
   SOLVE 
700
÷
1000
=
.70
 
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