When a number is divided by 12, the quotient and remainder are both 7. What is the number?
一个数除以12，商和余数都是7，这个数是多少．
<gadget id="calculator">7 * 12</gadget>
<output>84</output>

<gadget id="calculator">84 + 7</gadget>
<output>91</output>

<result>91</result>