A book has 160 pages. Xiao Ming reads (3/5) of the whole book on the first day and the rest (1/3) on the second day. How much of the whole book is left.
一本书有160页，小明第一天读了全书的(3/5)，第二天读了余下的(1/3)，还剩全书的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</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 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/5) * (2/3)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>