4个人只付3个人的钱用英语怎么说

Four people only paid three people's money

我认为这里有两层意思，一个是4个人只有3个人需要付钱，即一个人可以免费，那么笼统点就是说，four fellows,one guy for free.
另一层意思是，4个人只需分摊三个人的费用，那么 Four guys will apportion/should be charged three persons' fee.

4个人只付3个人的钱
Four individuals only pay the money three individuals

Four people with only one unpaid相信我