If after 400 grams of water were added to the 24%-solution of alcohol, the strength of the solution decreased by one-third, how much of the 24%-solution was used? Choose the correct choice from the following answers: A) 180 grams B) 220 grams C) 250 grams D) 350 grams E) 800 grams
I too think 800 grams should be the answer.   My reasoning is   The h20 content in 200 gms of water is 1   h20 content in 24% solution is 0.76   Resulting new solution's concentration decreases by one third means. Now it becomes 16% solution which means h20 content is 0.84   Let amount of solution be X   Then the equation can be set up   400*1 + 0.76X = 0.84 (X+400)   0.08X = 64   8X = 6400   X = 800 (ANS 800 grams)
<result>E</result>
If after 400 grams of water were added to the 24%-solution of alcohol, the strength of the solution decreased by one-third, how much of the 24%-solution was used?