There are 20 boys and 14 girls in Class 3, Grade 4. On average, each person donated 9 books to Hope Primary School. How many books did Class 3, Grade 4 donate in total?
四年级三班有20个男生，14个女生，平均每人捐了9本书给希望小学，四年级三班一共捐了多少本书？
<gadget id="calculator">20 + 14</gadget>
<output>34</output>

<gadget id="calculator">34 * 9</gadget>
<output>306</output>

<result>306</result>