The exhibition hall of the Academy of Fine Arts has 2 floors, each floor has 12 exhibition halls, and there are 720 paintings in total. How many paintings are placed in each exhibition hall on average?
美术学院的展览馆有2层，每层有12个展厅，一共放720幅画．平均每个展厅放了多少幅画？
<gadget id="calculator">720 / 2 / 12</gadget>
<output>30</output>

<result>30</result>