The sum of 15 consecutive even numbers is 4770, so what is the difference between the largest number and the smallest number?
15个连续偶数的和是4770，那么最大的数和最小的数相差多少．
<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>