Answer:
A tango is where couples dance in 2/4 or 4/4 time. 
Step-by-step explanation:
In 2/4, everyother beat is a strong down beat.
One Two One Two One Two
 In 4/4, every fourth beat is a strong down beat. 
One Two Three Four One Two Three Four
Both times are suitable for tango.
I hope you find this information useful and interesting! Good luck!