The little monkey picked 15 peaches in the morning, 6 fewer than the three times the amount picked in the afternoon. How many peaches did you pick in the afternoon?
小猴摘桃，上午摘了15只，比下午摘的3倍少6只．下午摘了多少只桃？
<gadget id="calculator">15 + 6</gadget>
<output>21</output>

<gadget id="calculator">21 / 3</gadget>
<output>7</output>

<result>7</result>