math
posted by N/A .
A nurse wants to add water to 18 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add? (Hint: Water is 0% benzalkonium chloride.)

A nurse wants to add water to 22 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?