A family desires to have two children. If the probability of having a boy is 80% and the probability of having a girl 20% because there are many boys in the family, what is the probability of the family having at least one girl?

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

Can someone answer this question for me

I’m really confused and need to learn this