There is a trapezoidal cotton field, the upper bottom is 190m, the lower bottom is 260m, and the height is 150m. If each cotton plant occupies an area of 0.12m**2, how many cotton plants are planted in this field?
有一块梯形棉花地，上底是190m，下底是260m，高为150m，如果每株棉花占地0.12m**2，这块地共种棉花多少株？
<gadget id="calculator">190 + 260</gadget>
<output>450</output>

<gadget id="calculator">150 / 2 / 0.12</gadget>
<output>625</output>

<gadget id="calculator">450 * 625</gadget>
<output>281_250</output>

<result>281_250</result>