Some of the 68% solution of acid was removed and this was replaced with an equal amount of 11% solution of acid. As a result, a 35% solution of acid was obtained. What fraction of the original solution was replaced?  Choose the correct option
A) 7/11
B) 7/17
C) 8/17
D) 8/19
E) 11/19
Let x be the fraction of the original solution that was replaced.   0.68*(1-x)+0.11(x)=0.35   0.57x=0.33   x=33/57=11/19   The answer is 11/19.
<result>E</result>
Some of the 68% solution of acid was removed and this was replaced with an equal amount of 11% solution of acid. As a result, a 35% solution of acid was obtained. What fraction of the original solution was replaced?