Lord Max Money gathers all his grandchildren and tells them: I am going to give £1215 to all the girls and £945 to all the boys. But don't worry, you will each

Lord Max Money gathers all his grandchildren and tells them: "I am going to give £1215 to all the girls and £945 to all the boys. But don't worry, you will each have the same amount of money in pounds sterling, corresponding to a whole number". How many grandchildren does he have ?

Pouvez-vous m'expliquer le raisonnement s'il vous plaît ? Merci :)