Brain teaser # 39

Prateek Agarwal (Sr. Executive - Finance & Accounts)   (1732 Points)

26 July 2012  

 

A farmer knows that 20 of his hens, housed in 3 coops, will hatch 30 eggs in 18 days. How long will it take 30 hens, housed in 4 coops to hatch the same number of eggs?