During recess activities, Beibei counted, there were 26 students playing table tennis on 8 table tennis tables, some were playing singles and some were playing doubles. Please count how many students are playing doubles.
课间活动时，贝贝数了数，8个乒乓球桌上有26名同学在打乒乓球，有进行单打的，也有进行双打的．请你算一算有多少名同学在玩双打．
<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<gadget id="calculator">26 - 16</gadget>
<output>10</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>