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# arithmetic

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Manager
Joined: 19 Aug 2009
Posts: 81
Followers: 1

Kudos [?]: 52 [0], given: 46

arithmetic [#permalink]  20 Aug 2009, 13:48
00:00

Difficulty:

(N/A)

Question Stats:

58% (02:47) correct 42% (00:44) wrong based on 11 sessions
1. Of the teams competing in the world archery championships, twenty percent are from Europe. Half as many are from the United States and one twentieth are from Africa. What fraction of teams are from neither Europe, the US or Africa.

A ) 13/20
B ) 15/20
C ) 13/15
D ) 17/20
E ) 13/17
Manager
Joined: 14 Aug 2009
Posts: 123
Followers: 2

Kudos [?]: 90 [1] , given: 13

Re: arithmetic [#permalink]  20 Aug 2009, 20:14
1
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KUDOS
virtualanimosity wrote:
1. Of the teams competing in the world archery championships, twenty percent are from Europe. Half as many are from the United States and one twentieth are from Africa. What fraction of teams are from neither Europe, the US or Africa.

A ) 13/20
B ) 15/20
C ) 13/15
D ) 17/20
E ) 13/17

Half as many means half of EU, then

EU 20%
US 10%
AF 5%

the rest is 65%, answer A
_________________

Kudos me if my reply helps!

Manager
Joined: 28 Jul 2009
Posts: 126
Location: India
Schools: NUS, NTU, SMU, AGSM, Melbourne School of Business
Followers: 6

Kudos [?]: 53 [0], given: 12

Re: arithmetic [#permalink]  20 Aug 2009, 22:48
flyingbunny wrote:
virtualanimosity wrote:
1. Of the teams competing in the world archery championships, twenty percent are from Europe. Half as many are from the United States and one twentieth are from Africa. What fraction of teams are from neither Europe, the US or Africa.

A ) 13/20
B ) 15/20
C ) 13/15
D ) 17/20
E ) 13/17

Half as many means half of EU, then

EU 20%
US 10%
AF 5%

the rest is 65%, answer A

One Question.
How could we determine "Half as many" are of EU only. I mean I took it as half of the total teams in the event. Though the answer that I got is not on the list. But still, if someone could put some light on it.
_________________

GMAT offended me. Now, its my turn!
Will do anything for Kudos! Please feel free to give one.

Manager
Joined: 09 Aug 2009
Posts: 56
Followers: 1

Kudos [?]: 4 [0], given: 1

Re: arithmetic [#permalink]  20 Aug 2009, 22:57
bhanushalinikhil wrote:
flyingbunny wrote:
virtualanimosity wrote:
1. Of the teams competing in the world archery championships, twenty percent are from Europe. Half as many are from the United States and one twentieth are from Africa. What fraction of teams are from neither Europe, the US or Africa.

A ) 13/20
B ) 15/20
C ) 13/15
D ) 17/20
E ) 13/17

Half as many means half of EU, then

EU 20%
US 10%
AF 5%

the rest is 65%, answer A

One Question.
How could we determine "Half as many" are of EU only. I mean I took it as half of the total teams in the event. Though the answer that I got is not on the list. But still, if someone could put some light on it.

Ya we can't take half as many of EU.
Assume X as total then
EU=0.2X and US=0.5X and AF=0.05X
EU+US+AF+other = 1X
0.2X+0.5X+0.05X+other =1X
other = 0.25X

/Prabu
Intern
Joined: 18 Dec 2010
Posts: 2
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: arithmetic [#permalink]  02 Jan 2011, 20:13
Assume 100 total people.

20% of 100 = 20 --->Europeans
1/2 of 20 ---> 10 Americans
1/20 of 100 ---> 5 Africans

Now you would add them all up, and minus it by the total (100). 100 - 35= 65. So, 65 people out of 100 are not EU, US or Africans. 65/100 is also equal to 13/20.

So therefore, the answer is A.
Manager
Joined: 18 Oct 2010
Posts: 95
Followers: 2

Kudos [?]: 7 [0], given: 0

Re: arithmetic [#permalink]  03 Jan 2011, 20:39
this question is not clearly. half of as many... ?
as many of what?
Manager
Joined: 21 Jul 2010
Posts: 56
Followers: 1

Kudos [?]: 7 [0], given: 3

Re: arithmetic [#permalink]  04 Jan 2011, 00:13
+1 for A

I understood half of EU.

It works by plugging numbers EU=20 US=10 and Africa=5
Re: arithmetic   [#permalink] 04 Jan 2011, 00:13
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# arithmetic

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