If after 700 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) 1400 grams
I too think 1400 grams should be the answer.   My reasoning is   The h20 content in 700 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   700*1 + 0.76X = 0.84 (X+700)   0.08X = 112   8X = 11200   X = 1400 (ANS 1400 grams)
<result>E</result>
If after 700 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?