trapezoidal open space, the upper base is 12 meters, the lower base is 30 meters, and the height is 8 meters. If you want to plant cherry trees in this open space, you can plant one cherry tree every 6 square meters. How many trees can be planted in this area? Cherry tree?
一块梯形空地，上底是12米，下底是30米，高是8米，如果要在这块空地上栽樱桃树，每6平方米栽一颗樱桃树，这块地一共可以栽多少棵樱桃树？
<gadget id="calculator">12 + 30</gadget>
<output>42</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">42 * 4</gadget>
<output>168</output>

<gadget id="calculator">168 / 6</gadget>
<output>28</output>

<result>28</result>