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Person A does 1/20 of a job in a day. Person B does 1/30 of a job in a day. How many days x will it take to do 1 job.

1/20 x + 1/30 x =1 (30/600 + 20/600)x =1 (5/60)x =1 x=12 days

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Q: Person A is completing job with 20 days and person B is completing same job with 30 days how many days will take if both of they r working 2 completing the same job?
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