Seats in the Circus

A circus tent in the mela can accommodate 100 people. It is divided into two zones: Zone 1 which has 30 seats and Zone 2 which has 70 seats. A total of 80 people came for the show and all the seats in Zone 1 were occupied.

1. What is the ratio of seats in Zone 1 to seats in Zone 2?

2. What is the ratio of empty seats to occupied seats in the tent?

3. What is the ratio of empty seats to occupied seats in Zone 2?
   
   
   (Write in your notebook)