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A, B and C can do a job working alone in...

A, B and C can do a job working alone in 50, 75 and 20 days respectively. They all work together for 4 days, then C quits. How many days will A and B take to finish the rest of the job?

A

20

B

30

C

18

D

24

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CHAMPION PUBLICATION-2017 TIER-II PAPER(7)-EXERCISE
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  4. A can do 50% of the job in 16 days, B can do (1)/(4)th of the job in 2...

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