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Sagot :
[tex]10\%=\frac{10}{100}=0.1\\\\0.1\cdot18ml=1.8ml-clear\ alcohol\\\\9\%=\frac{9}{100}=0.09\\\\w-added\ water\ (ml)\\18ml+w-9\%\ alcohol\ solution\\\\0.09(18+w)=1.8\ \ \ \ /:0.09\\18+w=20\ \ \ /-18\\w=2\\\\Answer:2ml.[/tex]
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