66 is 9 more than twice a number, what is this number?
66比一个数的2倍多9，这个数是多少？
<gadget id="calculator">66 - 9</gadget>
<output>57</output>

<gadget id="calculator">57 / 2</gadget>
<output>57/2 = around 28.5</output>

<result>57/2 = around 28.5</result>