A copy of "Quest for the Pyramids" has 180 pages in total. Li Lin read 45 of them. How many percent of the book did he not read?
一本《金字塔探秘》共有180页，李林看了其中的45页，还剩全书的百分之几没有看？
<gadget id="calculator">180 - 45</gadget>
<output>135</output>

<gadget id="calculator">135 / 180</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>