In a trapezoidal field, its upper and lower bases are 100 meters and 150 meters respectively, and its height is 80 meters. If each fruit tree covers an area of 12.5 square meters, how many fruit trees can be planted in this field?
一块梯形田地，它的上底、下底分别是100米、150米，高是80米．如果以每棵果树占地12.5平方米计算，这块田地一共可以栽多少棵果树？
<gadget id="calculator">100 + 150</gadget>
<output>250</output>

<gadget id="calculator">80 / 2 / 12.5</gadget>
<output>3.2</output>

<gadget id="calculator">250 * 3.2</gadget>
<output>800</output>

<result>800</result>