The difference between the numbers A and B is 7.2. If the decimal point of the number B is moved to the right by one, it is equal to the number A. What is the number A?
甲、乙两数的差是7.2，乙数的小数点向右移动一位就和甲数相等，甲数是多少？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">7.2 / 9</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 * 10</gadget>
<output>8</output>

<result>8</result>