79
google search
Google search results:
1: https://www.quora.com/One-man-3-women-and-4-boys-can-do-a-work-in-96-hrs-2-men-and-8-boys-can-do-it-in-80-hrs-and-2-men-and-3-women-can-do-it-in-120-hrs-In-how-many-hours-can-it-be-done-by-5-men-and-12-boys
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2: https://www.competoid.com/quiz_answers/14-0-60465/Question_answers/
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3: https://gmatclub.com/forum/1-man-3-women-and-4-boys-can-do-a-piece-of-work-in-96-hours-293575.html
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4: https://m4maths.com/6447-One-man-3-women-and-4-boys-can-do-a-piece-of-work-in-96-hours-2-men-and-8.html
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5: https://www.zigya.com/competition/SSCCGL/study/Quantitative+Aptitude/QA/Time+and+Work/QAENSL12167930/100
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6: https://interviewmania.com/discussion/85289-aptitude-time-and-work
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7: https://www.sarthaks.com/445326/one-man-3-women-and-4-boys-can-do-a-piece-of-work-in-96-hours-2-men-and-8-boys-can-do-it-in-80-hours
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8: https://www.ets.org/s/gre/pdf/practice_book_lit.pdf
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9: https://www.hufsd.edu/assets/pdfs/academics/algebra_text/Chapter06.pdf
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10: https://books.google.com/books?id=BwoEAAAAMBAJ&pg=PA120&lpg=PA120&dq=One+man,3+women+and+4+boys+can+do+a+piece+of+work+in+96+hours,2+men+and+8+boys+can+do+it+in+80+hours,2+men+and+3+women+can+do%0A(a)+39+1/11+hours%0A(b)+47+3/11+hours%0A(c)+43+7/11+hours%0A(d)+31+9/11+hours%0Aa%0Ab&source=bl&ots=u08V9llcmu&sig=ACfU3U2Dr0Kxft8oC8PBuln4_-23r_R8Mw&hl=en&sa=X&ved=2ahUKEwjIgb7e4d_yAhVWCM0KHQbwApAQ6AF6BAgVEAM
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11: https://books.google.com/books?id=tQ0EAAAAMBAJ&pg=PA68&lpg=PA68&dq=One+man,3+women+and+4+boys+can+do+a+piece+of+work+in+96+hours,2+men+and+8+boys+can+do+it+in+80+hours,2+men+and+3+women+can+do%0A(a)+39+1/11+hours%0A(b)+47+3/11+hours%0A(c)+43+7/11+hours%0A(d)+31+9/11+hours%0Aa%0Ab&source=bl&ots=OXqCLoSIqV&sig=ACfU3U3nZei506kl92uHiw2ep06rDY6VYw&hl=en&sa=X&ved=2ahUKEwjIgb7e4d_yAhVWCM0KHQbwApAQ6AF6BAgWEAM
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