Buying 5 park admission tickets can allow one more person to enter. Class 3 and Class 2 have a total of 48 people going to the park for high-level activities. How many tickets do you need to buy?
公园入场券买5张可以多让一个人进去．三、二班共有48人到公园高活动，需买多少张入场券．
<result>40</result>