For a decimal number, if the decimal point is moved one place to the right, the resulting number is 42.84 greater than the original number. What is the original number?
一个小数，若把小数点向右移动一位，则所得到的数比原数大了42.84，原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">42.84 / 9</gadget>
<output>4.76</output>

<result>4.76</result>