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moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

by moneyman » Thu Nov 20, 2008 4:58 am

Is it B?

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Maxx

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Source: Beat The GMAT — Data Sufficiency | Thu Nov 20, 2008 4:58 am

jackcrystal: Senior | Next Rank: 100 Posts; Posts: 31; Joined: Mon Aug 04, 2008 2:04 pm; Thanked: 1 times

by jackcrystal » Thu Nov 20, 2008 5:46 am

Lets its takes x hours

=>

72x = (72+8)(x-1)
72x = 80(x-1)
x = 10

(C)

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