Question 1145795
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How many milliliters of 30% acid solution need to be added to 55 mL of 50% acid solution {{{highlight(cross(that))}}} {{{highlight(cross(is))}}} <U>to get a</U> 40% acid <U>soultion</U>?
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Without solving any equations, each and every housewife, based on her common sense, will answer you :  


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;55 mL of 50% acid solution has to be added and mixed.