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When car X pulled into a service station, its gasoline

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When car X pulled into a service station, its gasoline  [#permalink]

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New post 31 Oct 2018, 10:55
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Difficulty:

  25% (medium)

Question Stats:

81% (00:59) correct 19% (00:53) wrong based on 38 sessions

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When car X pulled into a service station, its gasoline tank was \(\frac{1}{3}\) full. How many liters of gasoline did the attendant add to the tank at the station?

(1) The attendant added enough gasoline to fill the tank to \(\frac{9}{10}\) of its capacity.
(2) When car x pulled into the station, its gasoline tank contained 32 liters of gasoline.

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Re: When car X pulled into a service station, its gasoline  [#permalink]

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New post 31 Oct 2018, 11:03
Let x be total capacity.

STmt 1: Total added = (9/10)*x - (1/3)*x, but x is unknown, hence insufficient.
Stmt 2: Initial level = 32 = (1/3)*x, x can be found, but final level of tank not given, so cannot find how many litres added, hence insufficient.

Combined: x can be found from stmt 2, total added can be then found from stmt 1, hence sufficient.

Option C IMO, not sure why OA is D
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Re: When car X pulled into a service station, its gasoline  [#permalink]

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Re: When car X pulled into a service station, its gasoline   [#permalink] 31 Oct 2018, 11:13
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When car X pulled into a service station, its gasoline

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