A number is added, subtracted, and divided by itself. The result of adding their sum, difference, and quotient is 37.8. What is this number?
一个数与自己相加、相减、相除，他们的和、差、商相加的结果是37.8，这个数是多少．
<gadget id="calculator">37.8 - 1</gadget>
<output>36.8</output>

<gadget id="calculator">36.8 / 2</gadget>
<output>18.4</output>

<result>18.4</result>