Question
Aaru Swati and Rajni can finish a work in 4 days if they
work together. However, Aaru alone will take 9 days to complete the work, and Swati alone will complete the work in 12 days. How many days will Rajni take alone to complete the work?Solution
Aaru =A,Swati=S,Rajni =R 
Efficiency of R=Efficiency of (A+S+R)-(A+S) =9-7=2 Rajni takes time =36/2= 18days.
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