posted by 123 on .
in a boy's school, 5/8 of the boys play football and 4/7 play rugby.if every boy plays at least one of the two games, find the fraction of the boys who play both
Since the fraction of boys who play the games cannot exceed 1, so
4/7+5/8-1 is the fraction who plays both games.
5/8+4/7 - 1 =(35+32-56)/56 =(67-56)/56=11/56