# Mass Percentage Problem 3

Chemistry Level 2

In a $$10\%$$, $$50\text{ g}$$ $$\ce{NaOH}$$ solution, what is the mass of $$30\%$$ $$\ce{NaOH}$$ solution should I add in grams to produce a $$15\%$$ $$\ce{NaOH}$$ solution?

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