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PS ... Help.

by ramonsa » Wed Jun 03, 2009 2:30 pm
7. A certain elevator has a safe weight limit of 2,000 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 180 pounds and the average weight of the others being 215 pounds?
(A) 7
(B) 8
(C) 9
(D) 10
(E) 11
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Source: — Data Sufficiency |
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by vineetbatra » Fri Jun 05, 2009 12:51 pm
average of first 50% is 180 average of the balance is 215

so totall average is

180*.5+215*.5 = 197.5

2000/197.5 = 10.1 so the answer is 10

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by nervesofsteel » Sun Jun 07, 2009 1:07 pm
yes D for me too

180*(n/2)+215(n/2) = 2000
n = total number of people lift can carry..

n = 10.1

so ans 10
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