When a number is divided by 9, the quotient is 6 and the remainder is 6. What is the number?
一个数除以9，商是6，余数是6，这个数是多少．
<gadget id="calculator">6 * 9</gadget>
<output>54</output>

<gadget id="calculator">54 + 6</gadget>
<output>60</output>

<result>60</result>