Tongtong reads a copy of "Smart Backpack", reads 30 pages a day, and after 3 days, there is still the whole book (5/8) left unread, how many pages does this book have in total?
彤彤看一本《智慧背囊》，每天看30页，3天后还剩下全书的(5/8)没有看，这本书一共有多少页页．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">3 / (3/8)</gadget>
<output>8</output>

<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<result>240</result>