The ratio of the cut off of a wire to the rest is 3:7, how much of the wire is the rest
一根电线截去的和剩下的比是3：7，剩下的占这根电线的多少
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

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