Uncle Li has a vegetable field, where (1/5) grows cucumbers and (2/5) grows cabbage, how much is left?
李叔叔有一块菜地，这块的(1/5)种黄瓜，(2/5)种白菜，还剩下几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

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