After reading a 300-page book for 2 days, the number of pages read is the remaining (1/4), how many pages have been read?
读一本300页的书，读了2天后，已读的页数是剩下的(1/4)，求已读了多少页？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">300 * (1/5)</gadget>
<output>60</output>

<result>60</result>