When 84 is divided by a number, the quotient and remainder are both 7. What is the number?
84被一个数除，商和余数都是7，这个数是多少．
<gadget id="calculator">84 - 7</gadget>
<output>77</output>

<gadget id="calculator">77 / 7</gadget>
<output>11</output>

<result>11</result>