Press 72 according to 1: (1/3): (1/6), then how much is the middle part.
把72按1：(1/3)：(1/6)，那么中间那部分是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/3) / (1/6)</gadget>
<output>2</output>

<gadget id="calculator">6 + 2 + 1</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">72 * (2/9)</gadget>
<output>16</output>

<result>16</result>