A book has 75 pages, read (3/5) of it, how many pages have you read.
一本书有75页，看了它的(3/5)，看了多少页．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">75 * (3/5)</gadget>
<output>45</output>

<result>45</result>