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by pradeepkaushal9518 » Sat May 01, 2010 10:24 am
bob and alice can finish a job together in 3 hours . if bob can do the job by himself in 5 hours , what percent of the job does alice do ?
1. 20%
2.30%
3.40%
4.50 %
5.60 %
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by rn4gmat » Sat May 01, 2010 10:29 am
If Bob does it alone in 5hrs then in 3 hrs he does 60% of work so in 3 hrs Alice will do 40% or work.

Hope it helps.[/spoiler]
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by tpr-becky » Sat May 01, 2010 1:38 pm
If Bob does the job alone in 5 hours then his rate is 1/5 per hour - in three hours he does 3/5 of the job leaving Alice with 2/5 of the job to do which is equal to 40%.
Becky
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by pradeepkaushal9518 » Sat May 01, 2010 7:41 pm
thanks tpr for your response.
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