document.write( "Question 995803: One brand of cleaner used to etch concrete is 25% acid. A stronger industrial cleaner is 50% acid. How many litres of each cleaner should be mixed to produce 20 litres of a 40% acid solution? \n" ); document.write( "
Algebra.Com's Answer #614500 by josgarithmetic(39617)\"\" \"About 
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Different example, same type and method:
\n" ); document.write( "Just one variable for two-part mixture, percents
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