The school has opened up a new labor practice base. If each class is 20 square meters and 12 classes participate, and 3 classes are required to participate, how many square meters of experimental land will be allocated to each class on average?
学校新开辟了一块劳动实践基地，如果每班20平方米，12个班参加；又有3个班要求参加，那么平均每班分得多少平方米的实验地？
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">12 / 15</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 * (4/5)</gadget>
<output>16</output>

<result>16</result>