Question 6 (nov.14th)

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

by bacali » Fri Nov 14, 2008 1:13 pm

If x and y are positive integers, and x3y4 = 2,000, which of the following is the value of xy?

A. 2
B. 4
C. 8
D. 10
E. 20

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Source: Beat The GMAT — Problem Solving | Fri Nov 14, 2008 1:13 pm

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 » Fri Nov 14, 2008 1:18 pm

Primes of 2000

2*2*2*2*5*5*5

2^4*5^3=2000

xy = 2*5 = 10

IMO D

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

by bacali » Fri Nov 14, 2008 8:58 pm

Sorry it should read x^3y^4

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bhumika.k.shah: Legendary Member; Posts: 941; Joined: Sun Dec 27, 2009 12:28 amFollowed by: 1 member; Thanked: 20 times

by bhumika.k.shah » Sun Jan 17, 2010 2:36 am

backsolving would also help in this case.Though i agree it would be very time consuming!

Thanks dmateer

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