Subtract a whole tens number from 280, divide the difference by the whole number, the quotient is 6, what is the whole number?
从280里减去一个整十数，得到的差再除以这个整十数，商是6，这个整十数是多少？
<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<result>40</result>