The young pioneers mowed the grass. The first group of 14 people mowed a total of 154 kilograms of grass, and the second group of 13 people mowed a total of 117 kilograms of grass. How much more grass was mowed per person in the first group than in the second group?
少先队员割草，第一组14人，共割草154千克，第二组13人共割草117千克．第一组比第二组平均每人多割多少千克草？
<gadget id="calculator">154 / 14</gadget>
<output>11</output>

<gadget id="calculator">117 / 13</gadget>
<output>9</output>

<gadget id="calculator">11 - 9</gadget>
<output>2</output>

<result>2</result>