In order to welcome the Olympic Games, 1,800 square meters of lawns need to be laid around the stadium, and 25% of the total was completed in the first 5 days. According to this calculation, how many days will it take to complete it?
为迎接奥运会，在体育场周围需要铺1800平方米的草坪，前5天完成了全部的25%，照这样计算，全部完成还需多少天？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/4) / 5</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(3/4) / (1/20)</gadget>
<output>15</output>

<result>15</result>