A piece of cloth is used to make a coat (1/3) and trousers (1/2), how much is left?
一块布，做上衣用去(1/3)，做裤子用去(1/2)，还剩下几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>