A wire is 12 meters, used (1/3), how many meters are used
一根电线12米，用去了(1/3)，用去多少米
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 * (1/3)</gadget>
<output>4</output>

<result>4</result>