The sum of the numbers A and B is 305.8, and the decimal point of the number B is moved to the left by one bit, which is equal to 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一位就等于甲，那么甲数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

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

<result>27.8</result>