For an approximate trapezoidal vegetable plot, its upper base is 55 decimeters, its lower base is 85 decimeters, and its height is 20 decimeters. If 5 kilograms of vegetables are harvested per square meter, how many kilograms of vegetables are harvested in this vegetable plot?
一个近似的梯形菜地，它的上底是55分米，下底是85分米，高是20分米，如果每平方米收蔬菜5千克，这块菜地共收蔬菜多少千克？
<gadget id="calculator">55 + 85</gadget>
<output>140</output>

<gadget id="calculator">20 / 2 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">140 * (1/10) * 5</gadget>
<output>70</output>

<result>70</result>