A trapezoidal nursery, the upper bottom, lower bottom, and height are 32 meters, 28 meters, and 45 meters respectively. Three small saplings can be planted per square meter. How many small saplings can be planted in this nursery?
一块梯形的苗圃，上底、下底、高分别是32米、28米、45米，每平方米可以栽3棵小树苗，这块苗圃一共可以栽多少棵小树苗？
<gadget id="calculator">32 + 28</gadget>
<output>60</output>

<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<gadget id="calculator">60 * (45/2) * 3</gadget>
<output>4_050</output>

<result>4_050</result>