Move the decimal point of a number three places to the right first, and then two places to the left to get 7.2. What is the original number?
把一个数的小数点先向右移动三位，再向左移动两位后是7.2，原来的数是多少．
<gadget id="calculator">7.2 / 10</gadget>
<output>0.72</output>

<result>0.72</result>