A decimal, if its decimal point is moved one bit to the right, it will be 70.2 more than the original number. What is the original number?
一个小数，如果把它的小数点向右移动一位，就比原数多70.2，原来这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">70.2 / 9</gadget>
<output>7.8</output>

<result>7.8</result>