bucket of paint has 20 kilograms, pour out (2/5), how many kilograms are poured out.
一桶涂料有20千克，倒出(2/5)，倒出多少千克．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<result>8</result>