Obviously there are 30 kilograms of rice at home, and I ate (2/5), how many kilograms did I eat?
明明家里有30千克大米，吃了(2/5)，吃了多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<result>12</result>