There are a total of 36 peaches in a basket. If there are 16 red peaches and some more green peaches in the basket. How many green peaches are in the basket?
There are a total of 36 peaches in the basket. 
16 of those peaches are red. 
That means that there are 20 peaches that are not red. 
Since there are only two colors of peaches, those 20 peaches must be green. 

Therefore, there are 20 green peaches in the basket.