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 Post subject: Work rate questionPosted: Sun May 15, 2011 8:44 am

Joined: Wed Aug 04, 2010 12:21 pm
Posts: 1
Hi, please see the attaced file from the GMAC practice GMAT test. Why can 48 be chosen as the amount of work. When another number, e.g. 50, were chosen, the outcome would have been completely different, correct?

 Attachments: Schermafbeelding 2011-05-15 om 17.36.48.png [ 91.2 KB | Viewed 1683 times ]
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 Post subject: Re: Work rate questionPosted: Sun May 15, 2011 2:26 pm

Joined: Sun May 15, 2011 2:06 pm
Posts: 3
Sorry I don't have an answer but want to express I'm also having the same issue on similar problems and looking forward to the real explanation!

Some question explanations say to sub in arbitrary values, and others say to solve algebraically for similar questions. How are we supposed to know when to use which method?? It's very frustrating...

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 Post subject: Re: Work rate questionPosted: Mon May 16, 2011 6:17 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
it is not necessary to make any assumptions or chose any numbers ...

crew A: 1 house / 8 hours = 1/8 house/hr

crew B: 1/6 house/hr
crew C: 1/6 house/r

A,B, & C together: 1/8 + 1/6 + 1/6 = 22/48 house/hr

rate = work/time

time = work / rate = (1 house)/(22/48 house/hr) = 48/22 hours = 24/11 hours

2 2/11 hours

Veritas Help

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 Post subject: Re: Work rate questionPosted: Mon May 16, 2011 8:47 pm

Joined: Sun May 15, 2011 2:06 pm
Posts: 3
Oh, IIIIIIIIIII see. Thanks!

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