sixth-grade classmate filled a piece of wasteland with trees, and the area he planted on the next day was twice the area of the previous day. As a result, the fifth day was just full of trees. Ask the ((())/(()) of the land that was planted on the fourth day )).
六年级同学在一块荒地上载满树，后一天栽树的面积是前一天的2倍，结果第5天刚好栽满，问第4天栽了这块地的((())/(()))．
<gadget id="calculator">1 + 2 + 4 + 8 + 16</gadget>
<output>31</output>

<gadget id="calculator">1 / 31</gadget>
<output>1/31 = around 0.032258</output>

<gadget id="calculator">(1/31) * 8</gadget>
<output>8/31 = around 0.258065</output>

<result>8/31 = around 0.258065</result>