SOLUTION: Suppose you have an 8% NaOH solution. How much pure NaOH must you add in order to increase the concentration to 40%?

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Question 1124587: Suppose you have an 8% NaOH solution. How much pure NaOH must you add in order to increase the concentration to 40%?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming mass/mass,
and some known starting amount of your 8% NaOH, B

%288B%2B100x%29%2F%28x%2BB%29=40