A certain elevator has a safe weight limit of 1950 pounds. What is the greatest possible number of people who can safely ride on the elevator at one time with the average (arithmetic mean) weight of half the riders being 190 pounds and the average weight of the others being 200 pounds?	Answers:
A) 7	B) 8	C) 9	D) 10	E) 11
Lets assume there are 2X people.   Half of them have average weight of 190 and other half has 200.   Maximum Weight is = 1950   So 190*X + 200*X = 1950   =&gt; 390X = 1950   =&gt; X is approximately equal to 5.   So total people is  2*5= 
<gadget id="calculator"> 2*5</gadget>
<output>10</output>
10   Answer 10.
<result>D</result>
A certain elevator has a safe weight limit of 1950 pounds. What is the greatest possible number of people who can safely ride on the elevator at one time with the average (arithmetic mean) weight of half the riders being 190 pounds and the average weight of the others being 200 pounds?