The sum of the two numbers A and B is 2.53. When the decimal point of A is moved to the left, it is equal to B. What is the original number of A?
甲、乙两个数的和是2.53，当甲的小数点向左移动一位就等于乙，甲数原来是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">2.53 / 11</gadget>
<output>0.23</output>

<gadget id="calculator">0.23 * 10</gadget>
<output>2.3</output>

<result>2.3</result>