When two numbers are divided, the quotient is 15, and the remainder is 11. The sum of the dividend, divisor, quotient and remainder is 309, so what is the divisor?
两个数相除得商15，余数是11，被除数，除数，商和余数的和是309，那么除数是什么？
<gadget id="calculator">309 - 11 - 11 - 15</gadget>
<output>272</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<gadget id="calculator">272 / 16</gadget>
<output>17</output>

<result>17</result>