Mrs Brown goes up to a window to buy a cinema ticket .One person buys a ticket and walks away.There are now three people
问题描述：
Mrs Brown goes up to a window to buy a cinema ticket .One person buys a ticket and walks away.There are now three people in front lf Mrs Brown and four behind.
How many people go to the window to buy tikets at least?
答
9 personsReally?走了1个，前面有3个，后面有4个，加她不就至少有9个人买票么我也这么认为 ，但总觉得怪怪的。