A portion of the 50% solution of chemicals was replaced with an equal amount of 60% solution of chemicals. As a result, 55% solution of chemicals resulted. What part of the original solution was replaced?	Choose the correct choice from the following options:
A) 3/4
B) 1/4
C) 3/4
D) 2/5
E) 1/2
This is a weighted average question. Say x% of the solution was replaced --&gt; equate the amount of chemicals: 0.5(1-x)+0.6*x=0.55 --&gt; x=1/2.   Answer: 1/2.
<result>E</result>
A portion of the 50% solution of chemicals was replaced with an equal amount of 60% solution of chemicals. As a result, 55% solution of chemicals resulted. What part of the original solution was replaced?