A wire is 120 meters long, after cutting off (1/3), how many meters are left
一根电线长120米，截去(1/3)后，还剩多少m
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">120 * (2/3)</gadget>
<output>80</output>

<result>80</result>