The sum of the dividend, divisor, quotient, and remainder is 111, the quotient is 12, and the remainder is 4. What is the divisor?
被除数、除数、商、余数相加的和是111，商是12，余数是4，除数是多少．
<gadget id="calculator">111 - 4 - 4 - 12</gadget>
<output>91</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">91 / 13</gadget>
<output>7</output>

<result>7</result>