The blackboard newspaper has a total of 2 square meters, of which (2/7) is "mathematics world", (1/2) is "work garden", and the rest is "all over the world". What percentage of the blackboard newspaper is "all over the world"?
黑板报共2平方米，其中的(2/7)是"数学天地"，(1/2)是"习作园地"，剩下部分是"世界各地"．"世界各地"占黑板报的几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (2/7) - (1/2)</gadget>
<output>3/14 = around 0.214286</output>

<result>3/14 = around 0.214286</result>