To make 2.3*□+7.7*□=4.06, what is the number represented by □.
要使2.3*□+7.7*□=4.06，□代表的数是多少．
<gadget id="calculator">2.3 + 7.7</gadget>
<output>10</output>

<gadget id="calculator">4.06 / 10</gadget>
<output>0.406</output>

<result>0.406</result>