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A can do a work in x days while B can do...

A can do a work in x days while B can do the same work in y days then in how many days will they complete the work, working together?

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QUANTUM CAT-TIME AND WORK-QUESTION BANK
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  15. A can complete a work in 12 days, B in 15 days. Find the time taken by...

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  16. A can complete a work in 12 days, B in 15 days. Find the time taken by...

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  17. A can complete a work in 12 days, B in 15 days. Find the time taken by...

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  18. A can complete a work in 12 days, B in 15 days. Find the time taken by...

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  19. A can complete a work in 12 days, B in 15 days. Find the time taken by...

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