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google search
Google search results:
1: https://www.examveda.com/a-does-80-percent-of-a-work-in-20-days-he-then-calls-in-b-and-they-together-finish-the-remaining-work-in-3-days-how-long-b-alone-would-take-18341/
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2: https://www.quora.com/A-does-4-5-of-a-work-in-20-days-He-then-calls-in-B-and-they-together-finish-the-remaining-work-in-3-days-How-long-B-alone-would-take-to-do-the-whole-work
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3: https://www.toppr.com/ask/en-us/question/a-does-dfrac-4-5-of-a-work-in-20-days/
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4: https://www.toppr.com/ask/en-gb/question/a-doesdisplaystyle-frac45th-of-work-in-20-days-he-then-calls-in-b-and-they/
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5: https://www.indiabix.com/aptitude/time-and-work/discussion-828
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6: https://www.doubtnut.com/question-answer/a-does-4-5-of-a-work-in-20-days-he-then-calls-b-and-they-together-finish-the-remaining-work-in-3-day-3953021
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7: https://www.competoid.com/quiz_answers/14-0-60401/Question_answers/
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8: https://books.google.com/books?id=vQBQAAAAYAAJ&pg=RA15-PA26&lpg=RA15-PA26&dq=A+does+4/5+of+a+work+in+20+days.He+then+calls+in+B+and+they+together+finish+the+remaining+work+in+3+days+How+long+B+alone+would+tak%0A(a)23+days%0A(b)37+days%0A(c)37+%C2%BD+days%0A(d)40+days%0Aa%0Ab&source=bl&ots=d6sSrSZQVs&sig=ACfU3U331T5BHu9v5VWzFV-ktVED7J_HnA&hl=en&sa=X&ved=2ahUKEwi58O2a39_yAhXLAZ0JHUsNBDcQ6AF6BAgdEAM
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9: https://books.google.com/books?id=Oj8yAQAAMAAJ&pg=RA3-PA37&lpg=RA3-PA37&dq=A+does+4/5+of+a+work+in+20+days.He+then+calls+in+B+and+they+together+finish+the+remaining+work+in+3+days+How+long+B+alone+would+tak%0A(a)23+days%0A(b)37+days%0A(c)37+%C2%BD+days%0A(d)40+days%0Aa%0Ab&source=bl&ots=6N5uqo-Ylz&sig=ACfU3U1hb6nMcNoPO0z0mkrNLkPtMcIUbQ&hl=en&sa=X&ved=2ahUKEwi58O2a39_yAhXLAZ0JHUsNBDcQ6AF6BAgcEAM
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10: https://books.google.com/books?id=czw9P_xWJZAC&pg=PA108&lpg=PA108&dq=A+does+4/5+of+a+work+in+20+days.He+then+calls+in+B+and+they+together+finish+the+remaining+work+in+3+days+How+long+B+alone+would+tak%0A(a)23+days%0A(b)37+days%0A(c)37+%C2%BD+days%0A(d)40+days%0Aa%0Ab&source=bl&ots=1-Pf1Df-EE&sig=ACfU3U3N9kuM08wLIvf85VyKDJzf3Xoz1w&hl=en&sa=X&ved=2ahUKEwi58O2a39_yAhXLAZ0JHUsNBDcQ6AF6BAgeEAM
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