The average of 5 consecutive odd numbers is 17, what is the largest number among these five numbers?
5个连续奇数的平均数是17，这五个数中最大的数是多少．
<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">17 * 1</gadget>
<output>17</output>

<gadget id="calculator">17 + 4</gadget>
<output>21</output>

<result>21</result>