SOLUTION: I have a 4200 liters (SURTECH 650) solution 11%,how much i should add from (SURTECH 650)to make it 30% ?

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Question 880537: I have a 4200 liters (SURTECH 650) solution 11%,how much i should add from (SURTECH 650)to make it 30% ?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
What kind of percents are these, and what are the solution densities or specific gravities?