A takes 20 days---> 1 day work done by A is 1/20
B takes 30 days---> 1 day work done by B is 1/30
Together in 1 day---> 1/20=1/30=5/60=1/12 work is done
A quit 10 days before the project was completed which means B worked alone for 10 days and therefore complete 10*1/30 = 1/3rd of the total work.
2/3rd of the work was done by A and B together at 1/12th work per day.
Therefore days taken to complete work together = (2/3)/(1/12) = 24/3= 8 days
Therefore total days taken for completion of the project is 8+10 = 18 days
stumped by work flow problem
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HermioneGranger
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dendude
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dmateer & parallel_chase,
I think I did make the assumption that A quits 10 days before the time A&B together would've completed the job.
Going with the nature of the GMAT, this q could'nt have been that straightforward
Anyway thanks for pointing out the "fatal" consequences of assuming wrong on the GMAT.
I think I did make the assumption that A quits 10 days before the time A&B together would've completed the job.
Going with the nature of the GMAT, this q could'nt have been that straightforward
Anyway thanks for pointing out the "fatal" consequences of assuming wrong on the GMAT.
