Ratio of Adults to Children in a Community

In a certain community, the ratio of adults to children is 3:4. If there are 600 adults, how many children are there in the community? Additionally, a new policy is introduced that for every 3 adults there will be 5 children. What will be the total number of individuals (adults and children combined) in the community after this policy is implemented, given that no new adults are added or removed?