At present, the ratio of urban population to rural population in my country is about 7:13, and the percentage of urban population to the total population of the country is approximately.
目前，我国城市人口与农村人口的比约7：13，城市人口占全国总人口的百分比约多少．
<gadget id="calculator">7 + 13</gadget>
<output>20</output>

<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>