a=45, b is (1/5) of a, b=how much.
a=45，b是a的(1/5)，b=多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 * (1/5)</gadget>
<output>9</output>

<result>9</result>