bag of rice is eaten (1/5), and there are 36 kilograms left. How many kilograms have you eaten?
一袋米，吃了(1/5)，还剩36千克，吃了多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">36 / (4/5)</gadget>
<output>45</output>

<gadget id="calculator">45 - 36</gadget>
<output>9</output>

<result>9</result>