When Xiao Ming reads a book, he has already read 80% of the whole book. Among the following three statements, the incorrect statement is that the rest is the amount that has been read.
小明看一本书，已经看了全书的80%，下面三种说法中不正确的是剩下的是已看的多少
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>