Mathematics, 05.11.2020 17:40 dondre54
Mary and David can do a job alone for 10 days and 15 days respectively. At first 4 days alone then David went to work alone for 5 days. Maria completed the work in 4 days. If Mary, David, Maria would finish the work together in three days.
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Mary and David can do a job alone for 10 days and 15 days respectively. At first 4 days alone then D...
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