work problem

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baller12q: Senior | Next Rank: 100 Posts; Posts: 44; Joined: Sat Mar 28, 2009 11:28 am

by baller12q » Sun Mar 29, 2009 6:51 am

Each of 10 machines works at the same constant rate doing a certain job. The amount of time neeeded by the 10 machines, working together, to complete the job is 16 hours. How many hours would be needed if only 8 or the machines, working together, were used to complete the job.

i got this one wrong, can someone help me with this one.

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Source: Beat The GMAT — Problem Solving | Sun Mar 29, 2009 6:51 am

Neo2000: Legendary Member; Posts: 519; Joined: Sat Jan 27, 2007 7:56 am; Location: India; Thanked: 31 times

by Neo2000 » Sun Mar 29, 2009 7:30 am

Each machine is working for 16hrs.
So total work done = 10 x 16 = 160 machine hours

Now you have 8 machines to do a total of 160 machine hours
How long will they take??
160/8 = 20hours

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schowdhary: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Fri Mar 27, 2009 8:19 pm

Re: work problem

by schowdhary » Sun Mar 29, 2009 8:19 am

baller12q wrote:Each of 10 machines works at the same constant rate doing a certain job. The amount of time neeeded by the 10 machines, working together, to complete the job is 16 hours. How many hours would be needed if only 8 or the machines, working together, were used to complete the job.

i got this one wrong, can someone help me with this one.

I also agree with the answer that it will take 20 hours to do the same work. Please post the correct answer.

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vittalgmat: Legendary Member; Posts: 621; Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members; Thanked: 33 times

Re: work problem

by vittalgmat » Mon Mar 30, 2009 12:00 am

baller12q wrote:Each of 10 machines works at the same constant rate doing a certain job. The amount of time neeeded by the 10 machines, working together, to complete the job is 16 hours. How many hours would be needed if only 8 or the machines, working together, were used to complete the job.

i got this one wrong, can someone help me with this one.

Ballerq,
As I mentioned in an earlier post. Pls post the answer choices and the OA in a spoiler either by clicking the spoiler button once, type the answer and then click spoiler again or typing the spoler tag explicitly.

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baller12q: Senior | Next Rank: 100 Posts; Posts: 44; Joined: Sat Mar 28, 2009 11:28 am

by baller12q » Mon Mar 30, 2009 5:22 am

sorry about not putting the anwsers im new to this and thanks for helping me

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