10 times a number is 166.5 times greater than itself. What is the number?
一个数的10倍比它本身大166.5，这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">166.5 / 9</gadget>
<output>18.5</output>

<result>18.5</result>