At a certain committee meeting only associate professors and assistant professors are present. Each associate professor has brought 2 pencils and 1 chart to the meeting, while each assistant professor has brought 1 pencil and 2 charts. If a total of 10 pencils and 11 charts have been brought to the meeting, how many people are present?
Choose one
A) 6
B) 7
C) 8
D) 9
E) 10
Say there are 'A' associate professors. So we have 2A pencils and A charts.   Say there are 'B' assistant professors. So we have B pencils and 2B charts.   Total pencils are 10 so 2A + 7 = 10   Total charts are 11 so A + 27 = 11   Add both: 3A + 37 = 21 so A + 7= 
<gadget id="calculator">+ 7</gadget>
<output>7</output>
7   Total number of people= 7   ANSWER:7
<result>B</result>
At a certain committee meeting only associate professors and assistant professors are present. Each associate professor has brought 2 pencils and 1 chart to the meeting, while each assistant professor has brought 1 pencil and 2 charts. If a total of 10 pencils and 11 charts have been brought to the meeting, how many people are present?