The difference between the numbers A and B is 0.72, and the decimal point of the number B is moved to the right to be equal to the number A, so what is the number A?
甲乙两数的差是0.72，乙数的小数点向右移动一位后就和甲数相等，那么甲数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">0.72 / 9</gadget>
<output>0.08</output>

<gadget id="calculator">0.08 * 10</gadget>
<output>0.8</output>

<result>0.8</result>