The school needs to build an 800-square-meter playground, and 60% of it has been repaired. How many square meters are left to be repaired?
学校要修一个800平方米的操场，已经修了60%，还剩多少平方米没有修？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">800 * (2/5)</gadget>
<output>320</output>

<result>320</result>