The sum of the two numbers A and B is 5.28, and the decimal point of the number A is moved to the left by one bit to be equal to the number B. What is the number A?
甲、乙两数的和是5.28，甲数的小数点向左移动一位和乙数相等，甲数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">10 / 11</gadget>
<output>10/11 = around 0.909091</output>

<gadget id="calculator">5.28 * (10/11)</gadget>
<output>4.8</output>

<result>4.8</result>