Kobayashi reads a 120-page book. He reads (1/4) of the whole book on the first day and (1/3) of the whole book on the second day. How many more pages does Kobayashi have to read to finish this book?
小林看一本120页的书，第一天看了全书的(1/4)，第二天看了全书的(1/3)．小林再看多少页才能看完这本书？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">120 * (5/12)</gadget>
<output>50</output>

<result>50</result>