There is a trapezoidal land, the upper base is 64 meters long, 16 meters shorter than the lower base, and 50 meters high. On average, one fruit tree is planted every 15 square meters. How many fruit trees are planted in this land?
有一块梯形地，上底长64米，比下底短16米，高50米．平均每15平方米种一棵果树，这块地共种多少棵果树？
<gadget id="calculator">64 + 16 + 64</gadget>
<output>144</output>

<gadget id="calculator">50 / 2 / 15</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">144 * (5/3)</gadget>
<output>240</output>

<result>240</result>