A trapezoidal open space, the upper base is 25 meters, the lower base is 20 meters, and the height is 12 meters. It costs 1350 yuan to pave this open space with lawn, so how much is needed per square meter?
一块梯形空地，上底是25米，下底是20米，高是12米，要把这块空地铺上草坪共用1350元，那么每平方米需要多少元？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">1_350 / 270</gadget>
<output>5</output>

<result>5</result>