Divide a whole into 7 parts on average, how many such 5 parts are represented by fractions.
把一个整体平均分成7份，这样的5份用分数表示是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>