A room contains 200 people, 15 percent of whom are women. A group of people, 30 percent of whom are women, leaves the room. Of the people remaining in the room, 10 percent are women. How many people left the room? Select the correct option
A) 0 B) 05 C) 10 D) 15 E) 20
Say group of x people left the room.   # of women in the room was 0.15*200= 
<gadget id="calculator">0.15*200</gadget>
<output>30</output>
30;   # of women in the group that left 0.3x;   # of women in the room after the group left it is 0.1(160-x);   So, 30-0.3x= 0.1(200-x) --&gt; x=10.   Answer: 10.
<result>C</result>
A room contains 200 people, 15 percent of whom are women. A group of people, 30 percent of whom are women, leaves the room. Of the people remaining in the room, 10 percent are women. How many people left the room?