What quantity of 80% acid solution must be mixed with a 25% solution to..

What quantity of 80% acid solution must be mixed with a 25% solution to produce 660 mL of a 50% solution?
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mix 80% & 25% tu get 660 cc av 50%... x+y=660, or y=660-x... 0.8x +0.25y=660*0.5=330... 0.8x +0.25(660-x)=330... 0.8x -0.25x+165=330... 0.55 x=330-165=165... x=165/0.55=300... y=660-300=360
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