The sum of the numbers A and B is 305.8, and moving the decimal point of the number B one place to the left equals A, so what is the number A?
甲、乙两数的和是305.8，乙数的小数点向左移动一位就等于甲，那么甲数是多少？
<gadget id="calculator">1 + 10</gadget>
<output>11</output>

<gadget id="calculator">305.8 / 11</gadget>
<output>27.8</output>

<result>27.8</result>