The decimal point of the number A moves one place to the left, which is exactly equal to the number B. The sum of the two numbers is 23.1. What is the number B?
甲数小数点向左移动一位，正好和乙数相等，甲乙两数的和是23.1，乙数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">23.1 * (1/11)</gadget>
<output>2.1</output>

<result>2.1</result>