There are less than 20 pencils in the box, 3 people are distributed on average, 2 are left, and 5 people are distributed on average, 2 are left, how many pencils are in the box?
盒子里的铅笔不到20支，平均分给3人，还剩2支，平均分给5人，也剩2支，盒子里有多少支铅笔？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 2</gadget>
<output>17</output>

<result>17</result>