There are 351 grains of rice in the nine boxes numbered 1-9. It is known that each box has the same grain of rice more than the previous box. If there are 11 grains of rice in the No. 1 box, how many more grains of rice will be placed in the next box than the previous box.
编号为1-9的九个盒子中共放有351粒米，已知每个盒子都比前一号盒子多相同粒米．如果1号盒内放了11粒米，那么后面的盒子比它前一号的盒子多放多少粒米．
<gadget id="calculator">351 / 9</gadget>
<output>39</output>

<gadget id="calculator">2 * 39</gadget>
<output>78</output>

<gadget id="calculator">78 - 11</gadget>
<output>67</output>

<gadget id="calculator">67 - 11</gadget>
<output>56</output>

<gadget id="calculator">56 / 8</gadget>
<output>7</output>

<result>7</result>