SOLUTION: How much 20% disinfectant solution must be mixed with a 30% disinfectant solution to produce a 40gal of 27% disinfectant solution

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Question 821804: How much 20% disinfectant solution must be mixed with a 30% disinfectant solution to produce a 40gal of 27% disinfectant solution
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How much 20% disinfectant solution must be mixed with a 30% disinfectant solution highlight_green%28x%29

to produce a 40gal of 27% disinfectant solution

Question states***

.30x + .20(40-x) = .27*40gal ***    

 30x + 20(40-x) = 27*40gal     |after multiplying thru by 100

       10x = 280gal

         x = 28 gal

CHECKING our answer***

 8.4gal + 2.4gal = 10.8 gal  (amount of disinfectant)