April 2, 1805 is the birthday of Andersen, the master of Danish fairy tales. His book "Andersen's Fairy Tales" is very popular among children. Xiaoyue has read 144 pages, and there are still (2/5) left, how many pages are there in this book?
1805年4月2日是丹麦童话大师安徒生诞辰，其著作《安徒生童话》深受小朋友喜爱．小悦看了144页，还剩下(2/5)没看完，则这本书共有多少页．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">144 / (3/5)</gadget>
<output>240</output>

<result>240</result>