Qianjin Township plans to dig a 300-meter-long canal, and it has already been dug (4/5). How many meters are left to be dug?
前进乡计划挖一条300米长的水渠，已经挖了(4/5)，还剩下多少米没挖？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">300 * (1/5)</gadget>
<output>60</output>

<result>60</result>