Subtract a whole tens number from 450, divide the difference by the whole number, and the quotient is 8. How much is this whole tens?
从450里减去一个整十数，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">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">450 / 9</gadget>
<output>50</output>

<result>50</result>