There are 46 people in a class, 28 people can play volleyball, 30 people can play basketball, 2 people can play neither, how many people can play both.
某班有46人，会打排球的有28人，会打篮球的有30人，两种都不会的有2人，两种球都会的有多少人．
<gadget id="calculator">28 + 30</gadget>
<output>58</output>

<gadget id="calculator">46 - 2</gadget>
<output>44</output>

<gadget id="calculator">58 - 44</gadget>
<output>14</output>

<result>14</result>