If the decimal point of a number is moved one bit to the right, it will be 37.8 larger than the original number. What is the original number?
一个数的小数点向右移动一位，就比原数大37.8，原来这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">37.8 / 9</gadget>
<output>4.2</output>

<result>4.2</result>