Some of the 50% solution of acid was removed and this was replaced with an equal amount of 14% solution of acid. As a result, a 23% solution of acid was obtained. What fraction of the original solution was replaced?  Choose the correct option:  A) 1/2  B) 1/3  C) 2/3  D) 3/4  E) 4/5
Let x be the fraction of the original solution that was replaced.   0.5*(1-x)+0.14(x)=0.23   0.36x=0.27   x=3/4   The answer is 3/4.
<result>D</result>
Some of the 50% solution of acid was removed and this was replaced with an equal amount of 14% solution of acid. As a result, a 23% solution of acid was obtained. What fraction of the original solution was replaced?