Three friends rented a car for a week and divided the cost..

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lordspace: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Mon Aug 03, 2009 12:11 pm; Location: Canada; Thanked: 1 times; GMAT Score:380

by lordspace » Sat Jun 05, 2010 2:59 pm

here is the question.
I know it's a DS question but how would you construct the equations ?

Answer is B
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Source: Beat The GMAT — Data Sufficiency | Sat Jun 05, 2010 2:59 pm

Testluv: GMAT Instructor; Posts: 1302; Joined: Mon Oct 19, 2009 2:13 pmFollowed by: 164 members; Location: Toronto; Thanked: 539 times; GMAT Score:800

by Testluv » Sat Jun 05, 2010 5:46 pm

Let total cost be "c".

From the original we know that the cost is being evenly divided among three friends. So, the amount that each friend pays is given by the expression c/3.

(2) tells us that when we add another friend to the division of cost, each of the original three pay 15 less. So, now each of the original three pay c/3 - 15, so:

c/4 = c/3 - 15

from which we can compute "c" (not that we will because this is DS), and so (2) is sufficient.

Because (1) gives us no info about actual cost, (1) is insufficient.

Kaplan Teacher in Toronto

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