The sum of the two numbers A and B is 12.1, and the decimal point of A is moved one place to the left to be equal to the number B. What is the number A?
甲乙两数之和是12.1，甲数的小数点向左移动一位后和乙数相等，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">12.1 * (10/11)</gadget>
<output>11</output>

<result>11</result>