A piece of cloth, 8 meters are used up, and 4 meters are left, what percentage of the cloth is the remaining cloth?
一匹布，用去8米，还剩4米，剩下的布占这匹布的几分之几？
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>