There are less than 20 apples in a bag, and they are divided among 3 children or 5 children on average, and there are 2 left. How many apples are there in this bag?
有一袋苹果不到20个，平均分给3个小朋友或5个小朋友，都剩下2个，这袋苹果有多少个？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

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

<result>17</result>