QUESTION 6 (NOV.24TH)

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bacali: Master | Next Rank: 500 Posts; Posts: 245; Joined: Thu Aug 16, 2007 12:41 pm

by bacali » Mon Nov 24, 2008 11:48 am

Q19:

If 5^x – 5^(x-3) = (124)(5^y), what is y in terms of x?
A. x
B. x - 6
C. x - 3
D. 2x + 3
E. 2x + 6

OA: C

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Source: Beat The GMAT — Problem Solving | Mon Nov 24, 2008 11:48 am

dmateer25: Community Manager; Posts: 1049; Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members; Location: Pittsburgh, PA; Thanked: 113 times; GMAT Score:710

by dmateer25 » Mon Nov 24, 2008 4:30 pm

5^x – 5^(x-3) = (124)(5^y)

5^x - (5^x/5^3) = 124(5^y)

5^x(1 - 1/125) = 124(5^y)

5^x(124)/125=124(5^y)

5^x/125 = 5^y

5^x/5^3 = 5^y

5^x-3 = 5^y

x-3 = y

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