GMAT Prep # 21

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Steve Hwang: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Sun Aug 05, 2007 4:12 pm

by Steve Hwang » Fri Nov 02, 2007 10:22 am

21. Six machines, each working at the constant rate, together cna compete a certain job in 12 days. How many additional machines, each working at the same constant rate, will be needed to complete the job in 8days?

2 days
3 days
4 days
6 days
8 days

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Source: Beat The GMAT — Problem Solving | Fri Nov 02, 2007 10:22 am

ri2007: Master | Next Rank: 500 Posts; Posts: 258; Joined: Mon Aug 27, 2007 12:43 pm; Thanked: 15 times

by ri2007 » Fri Nov 02, 2007 11:45 am

6 machines take 12 days, so u need 9 machines to complete the job in 8 days
i.e 3 machines more
so ans is b

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Steve Hwang: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Sun Aug 05, 2007 4:12 pm

Got it

by Steve Hwang » Fri Nov 02, 2007 1:13 pm

I just understand this question correctly...

thanks for your explanation.

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