There are 48 students in a class, of which 40 can swim and 16 can ride a bicycle. Now we know that each person can swim or ride a bicycle at least one of them. How many people in the class can ride a bicycle and swim? How much?
某班共有学生48人，其中40人会游泳，16人会骑自行车，现在知道每人至少会游泳、骑自行车的一种，那么既会骑车、又会游泳的人占全班人数的几分之几？
<gadget id="calculator">16 - 48</gadget>
<output>-32</output>

<gadget id="calculator">40 + (-32)</gadget>
<output>8</output>

<gadget id="calculator">8 / 48</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>