An engineering team built a highway with a length of 180 kilometers, and built 1/4 of the full length in the first 5 months. According to this calculation, how many months will it take to complete the highway? (please use the easiest way to answer)
某工程队修一条长180千米的高速公路，前5个月修了全长的(1/4)，照这样计算，修完这条公路共需几个月？(请你用最简便的方法解答)
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>