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## Currency problem - GMAT Prep

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rahulvsd Really wants to Beat The GMAT!
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Currency problem - GMAT Prep Thu May 03, 2012 11:04 am
Elapsed Time: 00:00
• Lap #[LAPCOUNT] ([LAPTIME])
If 175 billion French Francs is equivalent to 35 billion United States dollars, which of the following expressions represents the number of USD equivalent to French Francs?

A. f - 140
B. 5f
C. 7f
D. f/5
E. f/7

OA: D.

Last edited by rahulvsd on Fri May 04, 2012 10:24 am; edited 1 time in total

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Thu May 03, 2012 11:52 am
rahulvsd wrote:
If 175 billion French Francs is equivalent to 35 billion United States dollars, which of the following expressions represents the number of USD equivalent to French Francs?

A. f - 140
B. 5f
C. 7f
D. f/5
E. f/7

OA: B.
175 billion French Francs is equivalent to 35 billion United States dollars.
175f = 35d

The problem asks for the number of USD equivalent to French Francs.
In other words:
How many US dollars are EQUAL IN VALUE to 1 French Franc?

Since 175f = 35d, f = (35/175)d = (1/5)d.

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Last edited by GMATGuruNY on Fri May 04, 2012 1:22 pm; edited 1 time in total

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rahulvsd Really wants to Beat The GMAT!
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Fri May 04, 2012 10:25 am
HI Mitch,

I got the same answer as you (B). But GMAT Prep says its D (f/5). This is a question from the extra questions package I purchased for \$24

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Bill@VeritasPrep GMAT Instructor
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Fri May 04, 2012 10:34 am
If 175 billion francs are equal to 35 billion dollars, then clearly each franc is only worth a fraction of a dollar.

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Fri May 04, 2012 10:46 am
Bill,

Is there a mistake in the official source? How do we report this to the GMAC?

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Fri May 04, 2012 12:40 pm
No, it's correct. It's the wording that's weird:

"...the number of USD equivalent to French Francs?"

In other words, how do we get from a certain number of francs to the equivalent number of dollars? Based on the numbers provided, we know that 175 billion francs are equivalent to 35 billion dollars. Thus, we can see that to go from 175 billion francs to 35 billion dollars, we must divide by 5, and from that we can determine dividing the number of francs (f) by 5 gives us the equivalent number of dollars.

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Fri May 04, 2012 1:39 pm
rahulvsd wrote:
HI Mitch,

I got the same answer as you (B). But GMAT Prep says its D (f/5). This is a question from the extra questions package I purchased for \$24
I've amended my post above. USD equilavalent to French Francs is the number of US dollars that is EQUAL IN VALUE to French Francs.
In other words, the EXCHANGE RATE: the number of US dollars that would be given in exchange for each French Franc.

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Thanked by: rahulvsd
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Fri May 04, 2012 2:32 pm
Nothing is more fun than trying to solve an ambiguously worded problem.

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Bill@VeritasPrep GMAT Instructor
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Sun May 06, 2012 2:22 pm
Nothing is more fun than trying to solve an ambiguously worded problem.
It's a good example of why we want to use the answer choices to guide our process.

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Tue May 08, 2012 9:19 pm
175/35 = f/d
5 = f/d
5d = f
d = f/5

D

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