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The average (arithmetic mean) of the 5 positive integers k,

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The average (arithmetic mean) of the 5 positive integers k, [#permalink]

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New post 05 Oct 2008, 16:49
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The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 16, and k < m < r < s < t. If t is 40, what is the greatest possible value of the median of the 5 integers?

A. 16
B. 18
C. 19
D. 20
E. 22

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Re: math [#permalink]

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New post 05 Oct 2008, 21:37
k < m < r < s < t, so the median of the list = r

r is the greatest possible when k, m, s are the smallest possible or k = 0, m = 1, s = r+1

sum = 0 + 1 + r + (r+1) + 40 = 16 x 5 = 80 => r = 19

So C is the answer

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Re: math [#permalink]

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New post 06 Oct 2008, 02:36
k < m < r < s < t, so the median in the following list is r.

r is the greatest possible when k, m, s are the smallest possible i.e. k = 1, m = 2, s = r+1
Note: k cannot be zero because they had mentioned k, m, r, s and t in question as positive integers.

sum = 1 + 2 + r + (r+1) + 40 = 16 x 5 = 80
=> r = 18

B is the answer. :-D
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Re: math [#permalink]

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New post 06 Oct 2008, 02:37
The anser is B

0 is neither positive nor negative.
Hence the smallest of the 2 can be 1 and 2

1+2+r+s+40 = 80
r+s = 37
The maximum value r can take is 18

Hence answer B

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Re: math [#permalink]

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New post 06 Oct 2008, 03:01
yes, zero is neither negative nor positive. Thanks!!! :-D

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Re: math [#permalink]

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New post 06 Oct 2008, 03:18
albany09 wrote:
The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 16, and k < m < r < s < t. If t is 40, what is the greatest possible value of the median of the 5 integers?

A. 16
B. 18
C. 19
D. 20
E. 22


k+m+r+s+t = 80 if t = 40 thus k+m+r+s = 40

k,m,r,s have different values not = 0 and r is in the middle of the values = median

least values of k,m= 1,2

thus s+r = 80 - 43 = 37

r<s thus , s<40

r can only be 18 so that s can be = 19 ( ie slightly bigger)

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Re: math [#permalink]

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New post 06 Oct 2008, 03:25
yezz wrote:
albany09 wrote:
The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 16, and k < m < r < s < t. If t is 40, what is the greatest possible value of the median of the 5 integers?

A. 16
B. 18
C. 19
D. 20
E. 22


k+m+r+s+t = 80 if t = 40 thus k+m+r+s = 40

k,m,r,s have different values not = 0 and r is in the middle of the values = median

least values of k,m= 1,2

thus s+r = 80 - 43 = 37

r<s thus , s<40

r can only be 18 so that s can be = 19 ( ie slightly bigger)


Let replace r with 19, can you find the other integers?

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Re: math [#permalink]

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New post 06 Oct 2008, 03:53
lylya4 wrote:
yezz wrote:
albany09 wrote:
The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 16, and k < m < r < s < t. If t is 40, what is the greatest possible value of the median of the 5 integers?

A. 16
B. 18
C. 19
D. 20
E. 22


k+m+r+s+t = 80 if t = 40 thus k+m+r+s = 40

k,m,r,s have different values not = 0 and r is in the middle of the values = median

least values of k,m= 1,2

thus s+r = 80 - 43 = 37

r<s thus , s<40

r can only be 18 so that s can be = 19 ( ie slightly bigger)


Let replace r with 19, can you find the other integers?


I am sorry , but i do not get your question, please rephrase

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Re: math   [#permalink] 06 Oct 2008, 03:53
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