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GMATT73
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 05:41
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Neil and Bob can finish a blow drying job together in 3 hours. If Bob can get the job done himself in 5 hours, what percent of the job does Neil do?



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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 06:27
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if you mean wut fraction of the job per hour then the answer is 2/15... if this is the case i will explain.
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GMATT73
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 06:55
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yezz
if you mean wut fraction of the job per hour then the answer is 2/15... if this is the case i will explain.
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Fraction or percent, either way. But your answer is incorrect. I am not giving the choices upfront here because I want to see how different people set up and solve the problem, rather than just backsolving.
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 07:04
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Is it 40%
Neil completes his job in 7.5 hrs if he works individually...so in 3 hrs his percent of work done would be 3/7.5 i.e 40%
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 07:51
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If Bob can do the whole job in 5 hours, he can do 3/5 of it in three hours. Thus Neil does 1-3/5= = 2/5 of the job in 3 hours
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 08:45
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kevincan
If Bob can do the whole job in 5 hours, he can do 3/5 of it in three hours. Thus Neil does 1-3/5= = 2/5 of the job in 3 hours
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This is still the fraction and not the percetage...

It should be 40%
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 10:22
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Answer: 40%

Combined rate Rc = 1/3
Bob's rate = 1/5
Neil's rate = 2/15

In 1 hour Neil completes 2/15th of the job, in 3 hours, he completes, 2/5th of job. i.e. 40%

Answer: 2/5 = 40%
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Neil and Bob can finish a blow drying job together in 3 28 Aug 2006, 11:07
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Yup 40% or 2/5th
Kevincan , great approach !!!



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