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# Two hundred gallons of fuel oil are purchased...

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Current Student
Joined: 06 Sep 2013
Posts: 2005
Concentration: Finance
Followers: 68

Kudos [?]: 643 [0], given: 355

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

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17 Sep 2013, 08:43
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Difficulty:

5% (low)

Question Stats:

92% (02:27) correct 8% (01:19) wrong based on 59 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: 38822
Followers: 7716

Kudos [?]: 105862 [0], given: 11593

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

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17 Sep 2013, 09:01
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: 2005
Concentration: Finance
Followers: 68

Kudos [?]: 643 [0], given: 355

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

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21 Sep 2013, 11:55
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: 38822
Followers: 7716

Kudos [?]: 105862 [0], given: 11593

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

### Show Tags

21 Sep 2013, 12:01
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, 12:01
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