Xiaojie reads a 120-page book, and it is known that he has read (1/4) of the whole book on the first day, so how many pages did he read on the first day.
小杰读一本120页的书，已知第一天读了全书的(1/4)，则第一天读了多少页．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">120 * (1/4)</gadget>
<output>30</output>

<result>30</result>