A book has 180 pages. I read one-third of it on the first day, and two-fifths on the second day. How many pages should I start reading on the third day?
一本书180页，第一天看了三分之一，第二看了五分之二，第三天应该从第多少页开始看．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (2/5)</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">180 * (11/15)</gadget>
<output>132</output>

<gadget id="calculator">132 + 1</gadget>
<output>133</output>

<result>133</result>