Xiaohua reads an extracurricular book. He reads (1/3) on the first day and (1/4) on the second day. There are still 140 pages left. Find the total number of pages?
小华读一本课外书，第一天读了(1/3)，第二天读了(1/4)，还剩下140页，求总页数？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) + (1/4)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1 - (7/12)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">140 / (5/12)</gadget>
<output>336</output>

<result>336</result>