If the decimal point of a decimal is moved one place to the right, the number will increase by 45.9. What is the original number?
把一个小数的小数点向右移动一位，这个数就比原来增加45.9，这个数原来是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">45.9 / 9</gadget>
<output>5.1</output>

<result>5.1</result>