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# On a certain transatlantic crossing, 20 percent of a ship's

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On a certain transatlantic crossing, 20 percent of a ship's [#permalink]  07 Oct 2008, 06:09
On a certain transatlantic crossing, 20 percent of a ship's passangers held round-trip tickets and also took their cars aboard the ship. If 60 percent of the passangers with round trip tickets did not take their cars aboard the ship, what percent of the ship's passangers held round-trip tickets?

33.3%
40%
50%
60%
66.6%
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Re: percentage problem from gmat prep [#permalink]  07 Oct 2008, 06:27
Let # of ppl with round trip tickets be x.
# of ppl with round trip tickets who did not take their cars aboard the ship = 0.6x
# of ppl with round trip tickets who took their cars aboard the ship = 0.2

0.2+0.6x=x => x=50%

What is OA?
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Last edited by leonidas on 07 Oct 2008, 07:07, edited 1 time in total.
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Re: percentage problem from gmat prep [#permalink]  07 Oct 2008, 06:55
leonidas wrote:
Let # of ppl with round trip tickets be x.
# of ppl with round trip tickets who did not take their cars aboard the ship = 0.6x
# of ppl with round trip tickets who did took their cars aboard the ship = 0.2

0.2+0.6x=x => x=50%

What is OA?

how did u get 50% from that equation?
_________________

The one who flies is worthy. The one who is worthy flies. The one who doesn't fly isn't worthy

Senior Manager
Joined: 29 Mar 2008
Posts: 350
Followers: 4

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

Re: percentage problem from gmat prep [#permalink]  07 Oct 2008, 07:06
spiridon wrote:
leonidas wrote:
Let # of ppl with round trip tickets be x.
# of ppl with round trip tickets who did not take their cars aboard the ship = 0.6x
# of ppl with round trip tickets who took their cars aboard the ship = 0.2

0.2+0.6x=x => x=50%

What is OA?

how did u get 50% from that equation?

0.2+0.6x=x
=> 0.2= (x-0.6x)
=> 0.2=0.4x
=> x= (0.2/0.4)
=> x= 1/2
=> x=50%

_________________

To find what you seek in the road of life, the best proverb of all is that which says:
"Leave no stone unturned."
-Edward Bulwer Lytton

Senior Manager
Joined: 04 Aug 2008
Posts: 379
Followers: 5

Kudos [?]: 28 [0], given: 1

Re: percentage problem from gmat prep [#permalink]  07 Oct 2008, 07:19
leonidas wrote:
spiridon wrote:
leonidas wrote:
Let # of ppl with round trip tickets be x.
# of ppl with round trip tickets who did not take their cars aboard the ship = 0.6x
# of ppl with round trip tickets who took their cars aboard the ship = 0.2

0.2+0.6x=x => x=50%

What is OA?

how did u get 50% from that equation?

0.2+0.6x=x
=> 0.2= (x-0.6x)
=> 0.2=0.4x
=> x= (0.2/0.4)
=> x= 1/2
=> x=50%

Yeah there is another explanation saying that u take 0.2 and compare it to 40% of those who didnt take their car which takes u to x=0.2/0.4 =50%

I didnt notice u can actually solve it by the way u did it
cool

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Posts: 350
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Re: percentage problem from gmat prep [#permalink]  07 Oct 2008, 07:23
Sorry, I usually use a 2D matrix for solving these kind of problems and I didn't draw that in my post.
I converted everything into decimals (rather than keeping it in percentage).
_________________

To find what you seek in the road of life, the best proverb of all is that which says:
"Leave no stone unturned."
-Edward Bulwer Lytton

Re: percentage problem from gmat prep   [#permalink] 07 Oct 2008, 07:23
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