Question

There are three rooms ,for entering into each room 10rs should be paid and while exiting from the room we need to pay 10 rs.when we enter into the room the money with us will be doubled .when we move from the all 3 rooms the money left is zero(0).now question is how much is carried before entering the rooms.

Answer 1

Explanation:

we have to carried 30 rs or 60 rs for entering and existing from room.