There is a number that is multiplied by 9 and added to 56 to get 218. What is this number?
有一个数乘9，再加上56，得218，这个数是多少
<gadget id="calculator">218 - 56</gadget>
<output>162</output>

<gadget id="calculator">162 / 9</gadget>
<output>18</output>

<result>18</result>