Day - 20 Dr. Sahab Series

If 20 engineers and 20 workers can together construct a 20 km road in 20 days. 40 engineers and 40 workers together construct 40 km road in how many days?

If 20 engineers and 20 workers can together construct a 20 km road in 20 days. 40 engineers and 40 workers together construct 40 km road in how many days?

M and N can complete a job in 18 days and 20 days, respectively. They worked on it on alternative days starting with M. Find the time taken to comlete it (in day)

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The median of a series is 10. Two additional observations 7 and 20 are added to series.The median of new series is (a) 9 (b) 20 (c) 7 (d) 10