There are 48 students in a class, everyone has at least one kind of bicycle or calculator, 28 have a calculator, 12 have both, how many students have bicycles?
一个班有48名学生，每人至少有自行车或计算器的一种，有28人有计算器，有12人两样都有，有自行车的学生有多少人．
<gadget id="calculator">28 - 12</gadget>
<output>16</output>

<gadget id="calculator">48 - 16</gadget>
<output>32</output>

<result>32</result>