Im trying to help my daughter with some math homework and Im stuck can you help me please this is the problem

Jeremy has been home sick with the flu for the last 7 days. While absent from school, he got 31 get well cards from friends. there were 5 more cards from girls than boys. he got a card from each one of his classmates, and 6 other cards from girls in other classes. how many boys and how many girls are there in Jeremys class