A portion of the 85% solution of chemicals was replaced with an equal amount of 30% solution of chemicals. As a result, 40% solution of chemicals resulted. What part of the original solution was replaced?	Pick one.
A) 5/11 B) 6/11 C) 7/11 D) 9/11 E) 13/6
This is a weighted average question. Say x% of the solution was replaced --&gt; equate the amount of chemicals: 0.85(1-x)+0.3*x=0.4 --&gt; x=9/11.   Answer: 9/11.
<result>D</result>
A portion of the 85% solution of chemicals was replaced with an equal amount of 30% solution of chemicals. As a result, 40% solution of chemicals resulted. What part of the original solution was replaced?