There are 48 students in a class, 27 of whom can swim, 32 can ride a bicycle, and 40 can play table tennis. So, at least how many students in this class can play these three sports?
某班共有48人，其中27人会游泳，32人会骑自行车，40人会打乒乓球．那么，这个班至少有多少学生这三项运动都会？
<gadget id="calculator">48 - 27</gadget>
<output>21</output>

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

<gadget id="calculator">48 - 40</gadget>
<output>8</output>

<gadget id="calculator">21 + 16 + 8</gadget>
<output>45</output>

<gadget id="calculator">48 - 45</gadget>
<output>3</output>

<result>3</result>