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work problem !! plzz help !!!

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by charmaine » Wed Jun 25, 2008 4:03 pm
working independantly, Sophia can finish a certain job in hald the time Monica can. If sophia works alone at the job for 5 days and then Monica work 6 days to finish the remaining job. how many days will it take Sophia to finish the whole job ?

answer is 6

i dun get why ?????

thanks thanks
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Re: work problem !! plzz help !!!

by Ian Stewart » Wed Jun 25, 2008 4:25 pm
charmaine wrote:working independantly, Sophia can finish a certain job in hald the time Monica can. If sophia works alone at the job for 5 days and then Monica work 6 days to finish the remaining job. how many days will it take Sophia to finish the whole job ?

answer is 6

i dun get why ?????

thanks thanks
Are you sure the answer is 6?

Sophia needs half as much time as Monica needs to do the same amount of work. We know that 5 days of Sophia's work plus 6 days of Monica's work finishes the job. Well, Sophia could have done Monica's share of the job in half the time: 3 days. It should therefore take Sophia 5+3 = 8 days to finish the job.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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by newera » Thu Jun 26, 2008 6:20 am
I got the same answer as Ian.

Are you sure you wrote this down correctly?

I don't see how 6 is possible
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by rros0770 » Thu Jun 26, 2008 12:10 pm
Agreed. I'm getting 8 as well based on the details posted...
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by charmaine » Thu Jun 26, 2008 11:15 pm
oppsss...my mistake :( i am soo sorry ..it is 8 sorry sorry :)
thanks u guys for your help :)
really appreciate it :)
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