China's population accounts for about 1/4 of the world's population. The world's population is about 5.2 billion, and China's population is about 100 million.
中国人口约占全世界人的(1/4)，全世界人口约52亿，中国人口约有多少亿．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">52 * (1/4)</gadget>
<output>13</output>

<result>13</result>