(7/15)/5=how much.
(7/15)/5=多少．
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(7/15) / 5</gadget>
<output>7/75 = around 0.093333</output>

<result>7/75 = around 0.093333</result>