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google search
Google search results:
1: https://www.quora.com/A-can-do-a-piece-of-work-in-14-days-which-B-can-do-in-21-days-They-begin-together-but-3-days-before-the-completion-of-the-work-A-leaves-off-What-is-the-total-number-of-days-to-complete-the-work
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2: https://gmatclub.com/forum/a-can-complete-a-project-in-20-days-and-b-can-complete-the-139311.html
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3: https://www.toppr.com/ask/en-jp/question/a-can-do-a-piece-of-work-in-9-days-and-b-in-18-days/
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4: https://www.careerbless.com/aptitude/qa/tnw1.php
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5: https://www.purplemath.com/modules/workprob4.htm
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6: http://www.wallace.ccfaculty.org/book/9.8%20Teamwork.pdf
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7: https://www.medicare.gov/Pubs/pdf/10153-Medicare-Skilled-Nursing-Facility-Care.pdf
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8: https://hbr.org/1998/05/the-alternative-workplace-changing-where-and-how-people-work
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9: http://www.corestandards.org/assets/Appendix_B.pdf
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10: https://books.google.com/books?id=6QYAAAAAMBAJ&pg=PA2&lpg=PA2&dq=Solve+the+following+problem+and+select+the+best+of+the+answer+choices+given.%0AA+can+complete+a+work+in+14+days+and+B+can+complete+the+same+work+in+21+days.+Both+of+them+started+the+work+together+but%0AB+leaves+3+days+before+the+completion+of+the+work.+In+how+many+days+does+the+work+gets+completed?%0A10.8+days%0A4.8+days%0A7.2+days%0A9.6+days%0AReset+Answer&source=bl&ots=krBt8vrDut&sig=ACfU3U0i55gIpfpkuq5JQnurOcyg2GdVuQ&hl=en&sa=X&ved=2ahUKEwjP5YSzv9_yAhWGGs0KHXxjDhIQ6AF6BAgTEAM
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