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Gmat Prep 2

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Gmat Prep 2

by abhinav85 » Wed Jun 24, 2009 7:58 pm
Is the average (airthmetic mean) of 5 different postive integers at least 30?

a.Each of the integers is a multiple of 10.

b.the sum of the 5 integers is 160.



D
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Re: Gmat Prep 2

by ssmiles08 » Wed Jun 24, 2009 8:38 pm
abhinav85 wrote:Is the average (airthmetic mean) of 5 different postive integers at least 30?

a.Each of the integers is a multiple of 10.

b.the sum of the 5 integers is 160.



D
1) the smallest multiple of 10 is 10. To take the smallest average, you can take consecutive multiples of 10: which in this case would be 10, 20 30, 40, 50.

avg of this set is (50+10)/2 = 30 SUFFICIENT.

2) is obvious. 160/5 = average which is > 30 SUFFICIENT.

(D)
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by Robinmrtha » Wed Jun 24, 2009 8:43 pm
At first glance the answer seems to be B here...
So after reading the question properly...
The trap here is that the question is stating that the integers are different...
If you ignore the different then the answer will be B which is wrong...

the question is asking if the sum of the integers is 150
Statement 1
The least possible value with the given condition is 10+20+30+40+50=150
Sufficient
Statement 2
160/5>30
Sufficient
Answer D
[/b]
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by abhinav85 » Thu Jun 25, 2009 4:24 am
Ya Robin

You rite dude............i missed that trap.......damn!!! :oops:

I chose B as my option.

Thx man.
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by mvaradan » Mon Jun 29, 2009 10:01 pm
For what its worth I think the trap is in the word 'atleast'.

1)says the different integers are multiples of 10, they could easily be 120, 130, 140, 150, 160 - in which case average would be much higher.

2) Is obvious as pointed out
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by aj5105 » Mon Jun 29, 2009 10:09 pm
(D)
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