Mingming did an average of 8 questions per minute in the first 3 minutes of doing oral calculations, and a total of 21 questions in the last 2 minutes. How many questions did Mingming do oral calculations on average per minute?
明明做口算前3分钟平均每分钟做8题，后2分钟一共做了21题，明明平均每分钟做多少题口算？
<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<gadget id="calculator">24 + 21</gadget>
<output>45</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>