A bag of potatoes weighs 30 kilograms. If you eat (2/5) of it, how many kilograms are you eating?
一袋土豆有30千克，吃了它的(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>