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A does 1/4 of a job in 9 days while B does 1/5 of the job in 10 days. Working together, how long will they take?

Correct Answer: 10 days

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Math MCQ: A does 1/4 of a job in 9 days while B does 1/5 of the job in 10 days. Working together, how long will they take? | Extra Education