What is the sum of the reciprocal of 0.4 and the reciprocal of 0.1?
0.4的倒数与0.1的倒数相加，和是多少．
<gadget id="calculator">1 / 0.4</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 + 10</gadget>
<output>12.5</output>

<result>12.5</result>