Divide a circle into 10 parts on average, take 3 of them, how much of the circle is left
把一个圆平均分成10份，取其中的3份，还剩下这个圆的多少
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>