Tom has 20 female guppies and 10 male guppies. If he gives away 5 female guppies and 5 male guppies, what fraction of the guppies left are female?

1 answer

20 females + 10 males = 30 guppies

after the great give-away:
15 females, 5 males, total left = 20
fraction of females of the remaining = 15/20 = 3/4