(1/2) of a bag of rice is 25kg, what is the weight of (2/5) of this bag of rice in kg?
一袋大米的(1/2)是25kg，这袋大米的(2/5)是多少kg．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">25 / (1/2)</gadget>
<output>50</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (2/5)</gadget>
<output>20</output>

<result>20</result>