A completes a work in 12 days. B completes the same work in 15 days. A started working alone and after 3 days B joined him. How many days will they now take together to complete the remaining work?
  1. 4
  2. 5
  3. 6
  4. 8
Explanation

Let us Find the Work Rate 
Now, Let us Assume  be the Number of Extra Days.

 for 

 for  

 



 

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