Given that □+□+□=37.5, □*○=22.5, ★/○=6, then ★=how much.
已知□+□+□=37.5，□*○=22.5，★/○=6，则★=多少．
<gadget id="calculator">22.5 / 12.5</gadget>
<output>1.8</output>

<gadget id="calculator">6 * 1.8</gadget>
<output>10.8</output>

<result>10.8</result>