# SOLUTION: how much alcohol must a nurse add to 10ml of a 60% alcohol solutions to strengthen it to 90% solution?

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 Question 418046: how much alcohol must a nurse add to 10ml of a 60% alcohol solutions to strengthen it to 90% solution?Answer by stanbon(57967)   (Show Source): You can put this solution on YOUR website!how much alcohol must a nurse add to 10ml of a 60% alcohol solutions to strengthen it to 90% solution? ---------- Equation: alcohol + alcohol = alcohol 0.60*10 + 1*x = 0.9(10+x) Multiply thru by 10 to get: 6*10 + 10x = 9*10+9x x = 3*10 x = 30ml (amt. of pure alcohol needed) =============== Cheers, Stan H. ========== --------------------------------------------------------------------------------