Arithmetic mean

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kaf: Senior | Next Rank: 100 Posts; Posts: 53; Joined: Mon Feb 09, 2009 12:18 am; Thanked: 1 times

by kaf » Thu Mar 26, 2009 2:38 am

Can some please help in explaining the solution to this problem

If x+ y = 8z, then which of the following represents the average
(arithmetic mean) of x,y, and z, in terms of z?

A. 2z + 1
B. 3z
C. 5z
D. z/3
E. 3z/2

thanks

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Source: Beat The GMAT — Problem Solving | Thu Mar 26, 2009 2:38 am

scoobydooby: Legendary Member; Posts: 1035; Joined: Wed Aug 27, 2008 10:56 pmFollowed by: 1 member; Thanked: 104 times

by scoobydooby » Thu Mar 26, 2009 2:45 am

arithmetic mean of x, y and z is (x+y+z)/3

given x+ y = 8z
so x+y+z=8z+z=9z
AM=9z/3=3z

hence B

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