The sum of the two numbers A and B is 305.8. If the decimal point of the number B is moved to the right by one bit, it is equal to the number A. What is the number A equal to?
甲、乙两数的和是305.8，乙数的小数点向右移动一位就等于甲数，甲数等于多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

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

<gadget id="calculator">305.8 - 27.8</gadget>
<output>278</output>

<result>278</result>