Question 257810
A chemist is making a solution that is to be 55% chlorine. He has one solution that is 40% chlorine and another that is 65% chlorine. He wants 100 liters of the final solution. How much of each should he mix? 
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It's not that complicated.
Equation:
chlorine + chlorine = chlorine
0.40x + 0.65(100-x) = 0.55*100
Multiply thru by 100 to get:
40x + 65*100 - 65x = 55*100
-15x = -10*100
x = 66 2/3 liters (amt. of 40% solution needed in the mixture)
100 - x = 33 1/3 liters (amt. of 65% solution needed in the mixture
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Cheers,
stan H.