Xiao Pang reads a book, read 45 pages in the first 3 days, and left 75 pages unfinished. Based on this calculation, how many days does it take Xiaopang to read the entire book?
小胖看一本书，前3天看了45页，还剩75页没看完．照这样计算，小胖看完整本书需要几天？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">75 / 15</gadget>
<output>5</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<result>8</result>