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Director
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Is the average(arithmetic mean) of 5 different positive [#permalink]
 01 Apr 2006, 16:48
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Is the average(arithmetic mean) of 5 different positive integers atleast 30?
1. Each of the integers is a multiple of 10.
2. The sum of 5 integers is 160.
My question is, is 0 multiple of 10?
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Success is my only option, failure is not -- Eminem
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VP
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Yeah 0 is a multiple of all numbers!
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VP
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I wud say that the answer is E!
Whats the oa?
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VP
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Re: Arithmetic mean [#permalink]
01 Apr 2006, 18:43
bewakoof wrote: Is the average (arithmetic mean) of 5 different positive integers atleast 30?
1. Each of the integers is a multiple of 10.
2. The sum of 5 integers is 160.
My question is, is 0 multiple of 10?
0 is multiple of all numbers but is not +ve. so we cannot consider it as a +ve multiple of 10 here.
D.
from i, the sum of the five different integers is 150. so the ave is at least 30. suff
from ii, if the sum of 5 numbers is 160, then their average is more than 30. suff.
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VP
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agreed! Missed the +ve Part
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Manager
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i also agree with D ... but good rule about 0 i had a DS where that was tested
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Director
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Thanks.. missed the positive integer part.. thought 0 was the multiple and chose B..
OA is D..
btw. prof.. you rock!!
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Current Student
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Agree with (D).
he fact that 0 is a multiple of all integers will most likely not be tested on the GMAT.
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VP
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This is where thye potentially test for 0 as a multiple of a number
http://www.gmatclub.com/phpbb/viewtopic ... 284#187284
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Current Student
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VP
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What I meant was that, they do have problems where they use test:
'0 as a multiple of a number'
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Director
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Re: Arithmetic mean [#permalink]
25 Apr 2007, 00:34
Why do we say that -
Professor wrote: from i, the sum of the five different integers is 150. so the ave is at least 30. suff
10 is also multiple of 10. So the minimum will be 10+10+10+10+10 = 50... How do we get 150? 
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Director
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Re: Arithmetic mean [#permalink]
25 Apr 2007, 00:37
nick_sun wrote: Why do we say that - Professor wrote: from i, the sum of the five different integers is 150. so the ave is at least 30. suff
10 is also multiple of 10. So the minimum will be 10+10+10+10+10 = 50... How do we get 150? "5 different positive integers "....least could be 10, 20, 30, 40, 50
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Director
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Re: Arithmetic mean [#permalink]
25 Apr 2007, 00:58
Juaz wrote: nick_sun wrote: Why do we say that - Professor wrote: from i, the sum of the five different integers is 150. so the ave is at least 30. suff
10 is also multiple of 10. So the minimum will be 10+10+10+10+10 = 50... How do we get 150? "5 different positive integers "....least could be 10, 20, 30, 40, 50 Oh, gosh! It is my silliest mistake  Thank you Juaz!
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Senior Manager
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yep its D.
Javed.
Cheers!
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GMAT Club Legend
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St1:
If the 5 integers are 10,20,30,40 and 50, then ave = 30. Since this is the smallest valid set of integers, so st1 is sufficient.
St2:
The average is alwasy 32. St2 is sufficient.
Ans D
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Manager
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I made the mistake of "at least", being different than "greater than"
Where at least means >= 30
But greater than means > 30
Crap!
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Director
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Re: Arithmetic mean [#permalink]
14 Oct 2007, 00:00
bewakoof wrote: Is the average(arithmetic mean) of 5 different positive integers atleast 30?
1. Each of the integers is a multiple of 10.
2. The sum of 5 integers is 160.
My question is, is 0 multiple of 10?
D,
Sum >=150 ?
1) Min possible sum: 10+20+30+40+50=150 or more SUFF
2) 160 is more than 150. SUFF.
D.
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Re: Arithmetic mean
[#permalink]
14 Oct 2007, 00:00
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close
