Ajay and vijay can do a piece of work in 28 days. With the help of manoj, they can finish it in 21 days. How long will manoj take to finish the work all alone? *
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Time taken by Ajay and Vijay to do a piece of work = 28 days
→ Ajay and Vijay one day's work = 1/28
→ Time taken by Ajay , Vijay and Manoj to do a piece of work = 21 days
→ Ajay and Vijay one day's work + Manoj one day's work = 1/21
→ 1/28 + Manoj one day's work = 1/21
→ Manoj one day's work = 1/21 - 1/28
= 1/84
So, Manoj can Accomplish this work while working alone in 84 days.
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