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11 consecutive integers

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Master | Next Rank: 500 Posts
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by sanjana » Wed Oct 14, 2009 2:25 am
if 11 consecutive integers are listed from least to most,what is the mean of the 11 digits?

a)Average of the 1st 9 is 7
b)Average of the last 9 is 9

[spoiler]OA : D[/spoiler]
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Source: — Data Sufficiency |
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Re: 11 consecutive integers

by JeffB » Wed Oct 14, 2009 8:00 am
sanjana wrote:if 11 consecutive integers are listed from least to most,what is the mean of the 11 digits?

a)Average of the 1st 9 is 7
b)Average of the last 9 is 9

[spoiler]OA : D[/spoiler]
For A:
Since we have consecutive integers x + (x+1) etc.

x + (x+1)....(x+8)= 7

You can solve for x (which is your first integer)...Suff

For B:
Same as a

start with (x+2)....(x+10) = 9

Solve for x again..Suff
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