# How much water must be added to $10\%$ of $350\text{mL}$ alcohol to dilute it to $5\%$

You have $350$ml of cider, with a $10\%$ alcohol content. If you want to dilute the drink to end up with a $5\%$ alcohol content, how much water would you need to add?

Hint: Let $x$ be the amount in ml to be added to the drink, then: $0.05(350+x) = 0.1(350)$
• I want a 5% alcohol content, which is $\frac1{20}$, so if I have __mL of alcohol, the total volume of the drink must be __mL