A bag of rice is 50 kilograms, and 12.5 kilograms are eaten. What you eat is how much is left.
一袋大米50千克，吃了12.5千克．吃了的是剩下的多少．
<gadget id="calculator">50 - 12.5</gadget>
<output>37.5</output>

<gadget id="calculator">12.5 / 37.5</gadget>
<output>0.333333</output>

<result>0.333333</result>