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google search
Google search results:
1: https://www.examveda.com/a-can-do-a-work-in-15-days-and-b-in-20-days-if-they-work-on-it-together-for-4-days-then-the-fraction-of-the-work-that-is-18333/
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2: https://www.toppr.com/ask/question/a-can-do-a-work-in-15-days-and-b-in-20-days-if-they/
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3: https://www.quora.com/A-can-do-a-work-in-15-days-and-B-in-20-days-If-they-work-together-for-4-days-then-what-is-the-fraction-of-work-that-is-left
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4: https://brainly.in/question/30852171
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5: https://www.indiabix.com/aptitude/time-and-work/discussion-821
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6: https://www.youth4work.com/Talent/Aptitude/Forum/112736-a-can-do-a-work-in-15-days-and-b-in-20-days-if-they-work-on-it-together-for-4-days-then-the-fraction-of-the-work-that-is-left-is?yFast=On
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7: https://gmatclub.com/forum/a-can-do-a-work-in-15-days-and-b-can-do-the-same-work-in-20-days-if-251256.html
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8: https://www.competoid.com/quiz_answers/14-0-60388/Question_answers/
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9: https://www.competoid.com/quiz_answers/14-0-60415/Question_answers/
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10: https://books.google.com/books?id=QFeIDwAAQBAJ&pg=PA62&lpg=PA62&dq=A+can+do+a+work+in+15+days+and+B+in+20+days.+If+they+work+on+it+together+for+4+days,+then+the+fraction+of+the+work+that+is+left%0AO+1/4%0AO+1/10%0AO+7/15%0AO+8/15&source=bl&ots=FfEfSANUdP&sig=ACfU3U3OVnuHYxRxkRwT_7FE_T8Ao_ywcg&hl=en&sa=X&ved=2ahUKEwiHhNTT4d_yAhWYW80KHaXiBUQQ6AF6BAgQEAM
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11: https://books.google.com/books?id=p0QhAQAAMAAJ&pg=PA114&lpg=PA114&dq=A+can+do+a+work+in+15+days+and+B+in+20+days.+If+they+work+on+it+together+for+4+days,+then+the+fraction+of+the+work+that+is+left%0AO+1/4%0AO+1/10%0AO+7/15%0AO+8/15&source=bl&ots=bN1Ozcpjga&sig=ACfU3U3QmniBwAkH-7gXe1DK6DZsqQpkWg&hl=en&sa=X&ved=2ahUKEwiHhNTT4d_yAhWYW80KHaXiBUQQ6AF6BAgREAM
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