If ★+★+★+★=100, (●+●)*★=100, then ★*●*●=how much.
如果★+★+★+★=100，(●+●)*★=100，那么★*●*●=多少．
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">100 / 25</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">25 * 2 * 2</gadget>
<output>100</output>

<result>100</result>