How much pure alcohol must be added to 500 milli litres of 16 percent solution to make its strength 30percent
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Step-by-step explanation:
16% 0f solution means it has 16 millitres of alchol in per 100 mililiters
therefore in 500mL solution tere will be 80 mL of alchol
to make it 30% there must be 30 mL of alchol in per 100 mL
therefore in 500 mL soultion there must be 150 mL of alcohol
therfore alchol added is 150 - 80 = 70mL
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