Divide a number by 15, the quotient is 12, and the remainder is 11. What is the number?
一个数除以15，商12，余11，这个数是多少．
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">180 + 11</gadget>
<output>191</output>

<result>191</result>