I would like to know the mathematics behind the answer to this riddle:
Alaro has a number of children. Each of Alaro's sons has twice as many sisters as he has brothers. Each of Alaro's daughters has the same amount of brothers as she has sisters. How many children does Alaro have and how many are sons and how many are daughters.
I know the answer to this by plugging in numbers but not the algebra for it. Any help would be appreciated. Thanks.