<PRE><B>Question 1121903</B>
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Joan has one solution that is 18% acid and a second solution that is 43% acid. How many liters of each should she mix together in order to get an 80-L solution that is 26.5% acid?
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A certain metal is 45% tin. How many kilograms of this metal should be mixed with 60% of 75kg tin to produce a 54% metal?
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The tin example problem:


x, kilograms of the 45% tin metal


{{{45x+60*75=54(x+75)}}}</PRE>