Divide a piece of cake into 5 parts on average, and express the number of such 2 parts.
把一块饼平均分成5份，这样的2份用多少表示．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>