A book has 105 pages in total. Xiao Ming read (2/3) of the whole book on the first day, and how many pages are left.
一本书共有105页，小明第一天看了全书的(2/3)，还剩多少页没看．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">105 * (2/3)</gadget>
<output>70</output>

<gadget id="calculator">105 - 70</gadget>
<output>35</output>

<result>35</result>