The school bought 135 pots of flowers first, and then another 45 pots. Distribute these flowers to 20 classes on average. How many potted flowers are distributed to each class on average? (column comprehensive formula)
学校先买来135盆花，又买了45盆．把这些花平均分给20个班级，平均每班分到几盆花？(列综合算式)
<gadget id="calculator">135 + 45</gadget>
<output>180</output>

<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<result>9</result>