Two hundred gallons of fuel oil are purchased... : GMAT Problem Solving (PS)
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# Two hundred gallons of fuel oil are purchased...

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Current Student
Joined: 06 Sep 2013
Posts: 2035
Concentration: Finance
GMAT 1: 770 Q0 V
Followers: 63

Kudos [?]: 604 [0], given: 355

Two hundred gallons of fuel oil are purchased... [#permalink]

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17 Sep 2013, 07:43
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Difficulty:

5% (low)

Question Stats:

91% (02:25) correct 9% (01:19) wrong based on 57 sessions

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Two hundred gallons of fuel oil are purchased at $0.91 per gallon and are consumed at a rate of$0.70 worth of fuel per hour. At this rate, how many hours are required to consume the 200 gallons of fuel oil?

(A) 140
(B) 220
(C) 260
(D) 322
(E) 330
[Reveal] Spoiler: OA
Math Expert
Joined: 02 Sep 2009
Posts: 37079
Followers: 7242

Kudos [?]: 96299 [0], given: 10732

Re: Two hundred gallons of fuel oil are purchased... [#permalink]

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17 Sep 2013, 08:01
jlgdr wrote:
Two hundred gallons of fuel oil are purchased at $0.91 per gallon and are consumed at a rate of$0.70 worth of fuel per hour. At this rate, how many hours are required to consume the 200 gallons of fuel oil?

(A) 140
(B) 220
(C) 260
(D) 322
(E) 330

1 gallon costs $0.91; Consumed at a rate of$0.70 worth of fuel per hour.

So, in 1 hour 0.7/0.91 gallons are consumed. Therefore, 200 gallons will be consumed in 200/(0.7/0.91) = 260 hours.

_________________
Current Student
Joined: 06 Sep 2013
Posts: 2035
Concentration: Finance
GMAT 1: 770 Q0 V
Followers: 63

Kudos [?]: 604 [0], given: 355

Re: Two hundred gallons of fuel oil are purchased... [#permalink]

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21 Sep 2013, 10:55
Bunuel wrote:
jlgdr wrote:
Two hundred gallons of fuel oil are purchased at $0.91 per gallon and are consumed at a rate of$0.70 worth of fuel per hour. At this rate, how many hours are required to consume the 200 gallons of fuel oil?

(A) 140
(B) 220
(C) 260
(D) 322
(E) 330

1 gallon costs $0.91; Consumed at a rate of$0.70 worth of fuel per hour.

So, in 1 hour 0.7/0.91 gallons are consumed. Therefore, 200 gallons will be consumed in 200/(0.7/0.91) = 260 hours.

How could you approximate to 260 hrs?
Math Expert
Joined: 02 Sep 2009
Posts: 37079
Followers: 7242

Kudos [?]: 96299 [0], given: 10732

Re: Two hundred gallons of fuel oil are purchased... [#permalink]

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21 Sep 2013, 11:01
jlgdr wrote:
Bunuel wrote:
jlgdr wrote:
Two hundred gallons of fuel oil are purchased at $0.91 per gallon and are consumed at a rate of$0.70 worth of fuel per hour. At this rate, how many hours are required to consume the 200 gallons of fuel oil?

(A) 140
(B) 220
(C) 260
(D) 322
(E) 330

1 gallon costs $0.91; Consumed at a rate of$0.70 worth of fuel per hour.

So, in 1 hour 0.7/0.91 gallons are consumed. Therefore, 200 gallons will be consumed in 200/(0.7/0.91) = 260 hours.

How could you approximate to 260 hrs?

$$\frac{200}{(\frac{0.7}{0.91})} = 200*\frac{10}{7}*\frac{91}{100} = 20*13=260$$.
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Re: Two hundred gallons of fuel oil are purchased...   [#permalink] 21 Sep 2013, 11:01
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