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google search
Google search results:
1: https://www.toppr.com/ask/question/a-can-do-a-piece-of-work-in-14-days-and-b-in-21-days/
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2: 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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3: https://www.careerbless.com/aptitude/qa/tnw1.php
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4: https://www.timesheets.com/blog/2013/11/calculating-time-off-by-hours-worked/
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5: https://testbook.com/question-answer/ratul-and-praful-together-can-complete-a-task-in-1--5df3a7bbf60d5d4cbdd33382
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6: https://upscfever.com/upsc-fever/en/apti/en-apti-chp11.html
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7: https://www.courts.ca.gov/documents/handbook.pdf
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8: https://socratic.org/algebra/expressions-equations-and-functions/problem-solving-models
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9: https://www.hud.gov/sites/documents/doc_10760.pdf
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10: https://books.google.com/books?id=sapiW58odQoC&pg=PA319&lpg=PA319&dq=A+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?%0A4.8+days%0A10.8+days%0A7.2+days%0A9.6+days%0AReset+Answer&source=bl&ots=SCqCkR-d3K&sig=ACfU3U3X0s40lev_HlRa_29wqzHRz_nppw&hl=en&sa=X&ved=2ahUKEwiIuuOZwN_yAhViAp0JHbnqCxQQ6AF6BAgSEAM
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