After the decimal point of a number is moved one place to the left, the original number is reduced by 11.7. What is the original number?
一个数的小数点向左移动一位后，比原来减少11.7，原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">11.7 / 9</gadget>
<output>1.3</output>

<gadget id="calculator">1.3 * 10</gadget>
<output>13</output>

<result>13</result>