15 times 30 is as many as 9 times.
30的15倍与9的多少倍一样多．
<gadget id="calculator">15 / 9</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">30 * (5/3)</gadget>
<output>50</output>

<result>50</result>