A book has 180 pages. Xiaohua reads (1/6) of it on the first day and the rest (1/3) on the second day. So how many pages should he read on the third day?
一本书180页，小华第一天看了它的(1/6)，第二天看了剩下的(1/3)，那么第三天他应从多少页看起．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">180 * (1/6)</gadget>
<output>30</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">180 * (5/6) * (1/3)</gadget>
<output>50</output>

<gadget id="calculator">30 + 50 + 1</gadget>
<output>81</output>

<result>81</result>