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percentage question....attachment included - Please help!

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Junior | Next Rank: 30 Posts
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by pirrum » Thu Jan 10, 2013 11:21 am
Hi there,

I've been trying to work out this percentage question - but I've become a little stuck! Any help would be greatly appreciated. The image of the question is attached.

Please could you also try and show workings too - so I can learn from my errors! :)

Thanks.
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Last edited by pirrum on Thu Jan 10, 2013 1:15 pm, edited 1 time in total.
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Source: — Quantitative Reasoning |
Junior | Next Rank: 30 Posts
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by pirrum » Thu Jan 10, 2013 12:24 pm
Anyone?
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by Tommy Wallach » Wed Jan 16, 2013 4:21 pm
Hey Pirrum,

What is the source of this question? The way it's written doesn't make sense, and it's full of grammatical errors (You would say "By what percent" not "by how many percent"). Also, the final question doesn't make clear what it means. Per year? Per month?

However, what they actually want you to do is ASSUME that the number of passengers per flight has been constant. If we do that, we can take .3 * 1000 as the distance traveled five years ago, and .9 * 800 as the distance traveled now.

The equation for percent change is different/original * 100. The original distance is 300, and the new distance is 720.

Difference = 420
Original = 300

420/300 * 100 = 140%.

Make sense?

-t
Tommy Wallach, Company Expert
ManhattanGMAT

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