Gmat Prep 2

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abhinav85: Master | Next Rank: 500 Posts; Posts: 179; Joined: Mon Dec 29, 2008 4:41 am; Thanked: 2 times

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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Source: Beat The GMAT — Data Sufficiency | Wed Jun 24, 2009 7:58 pm

ssmiles08: Master | Next Rank: 500 Posts; Posts: 472; Joined: Sun Mar 29, 2009 6:54 pm; Thanked: 56 times

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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Robinmrtha: Senior | Next Rank: 100 Posts; Posts: 91; Joined: Wed Apr 01, 2009 9:53 pm; Thanked: 11 times

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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abhinav85: Master | Next Rank: 500 Posts; Posts: 179; Joined: Mon Dec 29, 2008 4:41 am; Thanked: 2 times

by abhinav85 » Thu Jun 25, 2009 4:24 am

Ya Robin

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

I chose B as my option.

Thx man.

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mvaradan: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Sun Mar 01, 2009 3:32 am

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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aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Mon Jun 29, 2009 10:09 pm

(D)

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