What are the special features of the following group of elements? 1. All these elements are metals 2. All these elements react with water to form hydrogen gas 3. All these elements have a valency 1
Janki and Mansi, working separately, can paint a wall in 45 and 72 days respectively. They started working together but Janki left the work 33 days before the completion of the work. In total, how many days did it take to complete the work?