1.On the farm,there are twelve ducks and eight pigs.look!There are four ducks swimming in the pond

1.On the farm,there are twelve ducks and eight pigs.look!There are four ducks swimming in the pond
how many animals on the farm?what operation do you use
2.in the supermarket,there are 28basketbals ,i buy two,and Jerry buys 4 basketalls.How many basketballs left in the supermarket?What operation do you use?
Write a problem in English and solve it.