Xiao Ming reads a book, on the first day he reads the whole book (1/4), on the second day he reads the whole book (2/5), on the third day he reads the whole book (1/3), what fraction of the whole book is left Didn't read it?
小明读一本书，第一天读全书的(1/4)，第二天读全书的(2/5)，第三天读全书的(1/3)，还剩全书的几分之几没有读？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/4) - (2/5) - (1/3)</gadget>
<output>1/60 = around 0.016667</output>

<result>1/60 = around 0.016667</result>