SOLUTION: how many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution

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Question 366358: how many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
0.90x + 0.15(6) = 0.40(x + 6)

Can you take it from here?