300 adults have to take care of may be 600, those 600 can then take care of 1200 and so on. Thought this forum was for folks with basic intelligence.
The poorest and hated folks would be the first to go to mars, (think of illegal immigrants in USA, both democrats and republicans might agree to give citizenship of their relatives if they volunteer to go to Mars) these people would eventually build their own civilization would be envy of earth.