Question

In America there are 1000000 people if each family has 4 children what is the percentage of the children

Answer 1

There is not enough information to answer this question accurately. We would need to know how many families there are in America in order to determine the percentage of children.

Answer 2

each family has two adults and 4 children?
If so, then the children are 4/6 = 66.66%