Question
Atul can do a piece of work in 18 days, Aaravya is 50%
more efficient than Atul. How much more time does Atul take than Aaravya to do the same piece of work?Solution
Atul can do a piece of work = 18 days. Let the efficiency of Atul =100 So, Aaravya’s efficiency =150. 
ATQ-  3=18 1=6   Aarvaya’s time =2×6=12. Maximum time =18-12 =6days.
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