Students exercise. There are 350 people who participate in running, which is 7 times that of the students who participate in playing basketball. How many people participate in playing basketball than those who participate in running?
同学们锻炼身体．参加跑步的有350人，是参加打球的同学的7倍，参加打球的比参加跑步的少多少人？
<result>50</result>