Subtract an integer number from 720, divide the difference by the integer number, and the quotient is 8. How much is this whole tens?
从720里面减去一个整十数，得到的差再除以这个整十数，商是8．这个整十数是多少？
<gadget id="calculator">720 / 9</gadget>
<output>80</output>

<result>80</result>