Question 1013417
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The radiator of a truck contains 12 gallons of water 3 galloons were drawn off and replace it with alcohol, then another 3 galloons were drawn from the mixture and replace it pure alcohol, and so on until 8 drawings and replacement have been made. How much  alcohol is in the final mixture? 
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Look into the lesson <A HREF=http://www.algebra.com/algebra/homework/Sequences-and-series/Word-problems-on-geometric-progressions.lesson>Word problems on geometric progressions</A> in this site, Problems 1 and 2. 


Consider them as samples. Read it attentively and then try to solve yours by substituting your data.