Xiao Hong reads a 60-page book, and reads (1/4) of the full pages on the first day. How many pages are left?
小宏看一本60页的书，第一天看了全页数的(1/4)，还剩下多少页没有看？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 * (1/4)</gadget>
<output>15</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<result>45</result>