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# Regarding an IR question GMAT prep 5

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Intern
Joined: 23 Jul 2015
Posts: 10
Regarding an IR question GMAT prep 5  [#permalink]

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03 Feb 2017, 22:37
1
hi Can someone please tell me as to why am I wrong here?
need help urgently.
GMAT on 8th feb
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Intern
Joined: 23 Nov 2013
Posts: 20
Regarding an IR question GMAT prep 5  [#permalink]

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04 Feb 2017, 11:38
1. Freight railroad companies nearly all costs and from 1980 to 2009 railroad reinvested approximately 30% of their total revenue. therefore you can not tell exactly what percentage of their total revenue was invested.

2. from the information we can only infer that railroad is more fuel efficient. therefore we can not tell which one buys more fuel.

3. 325 billion is their approximately 30% of the revenue. so we can calculate approximate revenue
approximate revenue = 325 billion/0.3
key here is word approximate
Intern
Joined: 23 Jul 2015
Posts: 10
Re: Regarding an IR question GMAT prep 5  [#permalink]

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07 Feb 2017, 03:16
thanks Raghaw

you are right, I missed out on approximate part.
but just one query.
I assumed that since freight by rail is more fuel efficient, the corresponding fuel consumption should also lesser as compared to that by trucks. I mean would this not be logical?

raghaw wrote:
1. Freight railroad companies nearly all costs and from 1980 to 2009 railroad reinvested approximately 30% of their total revenue. therefore you can not tell exactly what percentage of their total revenue was invested.

2. from the information we can only infer that railroad is more fuel efficient. therefore we can not tell which one buys more fuel.

3. 325 billion is their approximately 30% of the revenue. so we can calculate approximate revenue
approximate revenue = 325 billion/0.3
key here is word approximate
Intern
Joined: 23 Nov 2013
Posts: 20
Re: Regarding an IR question GMAT prep 5  [#permalink]

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07 Feb 2017, 05:44
No
Railroads are more fuel efficient than trucks means for transporting same volume of fright to same distance, railroads will consume less fuel. but imagine the situation that more freights are transported via railroads than via trucks.
suppose 70% of freight is transported via railroads and 30% via trucks and also assume that railroads are 25% more fuel efficient. In this case ratio of fuel consumption by railroads to by trucks = 70 / (30 * 1.25) = 1.867. here railroads are consuming 86.7% more fuel than trucks.
Re: Regarding an IR question GMAT prep 5 &nbs [#permalink] 07 Feb 2017, 05:44
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# Regarding an IR question GMAT prep 5

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