A square table can seat 2 people on each side, how many people can sit on three square tables put together.
一张方桌每边能坐2人，三张方桌拼在一起可坐多少人．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>