Li Ming planned to finish reading a 120-page book in three days. He read the whole book (2/5) on the first day, read 30% of the whole book on the second day, finished the rest on the third day, and read it on the third day. how much of the book
李明计划三天读完一本120页的书，第一天看了全书的(2/5)，第二天看了全书的30%，剩下的第三天看完，第三天看了全书的多少
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (2/5) - (3/10)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>