If twice the number A is 1/3 of the number B, then twice the number B is the number A.
如果甲数的2倍是乙数的(1/3)，那么乙数的2倍是甲数的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 * 6</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<result>12</result>