(1/5) of a bag of rice is 15kg, what is the weight of (2/3) of this bag of rice in kg?
一袋大米的(1/5)是15kg，这袋大米的(2/3)是多少kg．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / (1/5)</gadget>
<output>75</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">75 * (2/3)</gadget>
<output>50</output>

<result>50</result>