SOLUTION: antiseptic solutions. a nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute ot to an 8% solution. how much water must she add?

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Question 792580: antiseptic solutions. a nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute ot to an 8% solution. how much water must she add?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
30%2A10%2F%2830%2Bm%29=8
8%28m%2B30%29=300
m%2B30=300%2F8
m=300%2F8-30=150%2F4-30=75%2F2-30=%2875-60%29%2F2=15%2F2
highlight%28m=7%261%2F2%29 ounces of water