Arithmetic

Each of the 30 boxes in a certain shipment weighs either 10 pounds or 20 pounds, and
average (arithmetic mean) weight of the boxes in the shipment is 18 pounds. If the
average weight of the boxes in the shipment is to be reduced to 14 pounds by removing
some of the 20-pound boxes, how many 20-pound boxes must be removed?
A. 4
B. 6
C. 10
D. 20
E. 24

Thank you

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papgust: Community Manager; Posts: 1537; Joined: Mon Aug 10, 2009 6:10 pm; Thanked: 653 times; Followed by:252 members

by papgust » Thu Mar 11, 2010 6:03 pm

https://www.beatthegmat.com/ps-t18734.html

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