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Three pieces of wire have an average (arithmetic mean)

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Three pieces of wire have an average (arithmetic mean) [#permalink] New post 10 Oct 2008, 10:23
Three pieces of wire have an average (arithmetic mean) length of 39 inches and a median length of 48 inches. What is the maximum possible length, in inches, of the shortest piece of wire?

A. 21
B. 24
C. 27
D. 30
E. 33
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Re: wire [#permalink] New post 10 Oct 2008, 10:27
39*3 = 117

117-48-48 = 21

20,48,48

the answer is (a)

:)
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Re: wire [#permalink] New post 10 Oct 2008, 10:39
chenhong1224 wrote:
Three pieces of wire have an average (arithmetic mean) length of 39 inches and a median length of 48 inches. What is the maximum possible length, in inches, of the shortest piece of wire?

A. 21
B. 24
C. 27
D. 30
E. 33


TOTAL LENGHT = 117

LENGHT OF THE UNKNOWN 2 PIECES = 117- 48 = 69

X,MEDIAN,Y

Y CAN BE MAX WHEN X IS MIN , MIN VALIUE X CAN BE IS = ,MEDIAN = 48

69 - 48 = 21...A
Re: wire   [#permalink] 10 Oct 2008, 10:39
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Three pieces of wire have an average (arithmetic mean)

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