A book has 16 pages. Xiao Ming has read (1/4) of it. How many pages have he read?
一本书有16页，小明看了它的(1/4)，看了多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 * (1/4)</gadget>
<output>4</output>

<result>4</result>