Two solutions of $90\%$ and $97\%$ purity are mixed resulting in $21$ litres of mixture of $94\%$ purity. How much is the quantity of the first solution in the resulting mixture?
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Two solutions of $90\%$ and $97\%$ purity are mixed resulting in $21$ litres of mixture of $94\%$ purity. How much is the quantity of the first solution in the resulting mixture?