The shape of a garden is trapezoidal. Its upper base is 160 meters, lower base is 180 meters, and its height is 50 meters. If two roses can be planted per square meter, how many roses can be planted?
一个花园的形状是梯形．它的上底是160米，下底是180m，高是50m，如果每平方米可以栽种2棵玫瑰花，那么可以栽种多少棵玫瑰？
<gadget id="calculator">180 + 160</gadget>
<output>340</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">340 * 25 * 2</gadget>
<output>17_000</output>

<result>17_000</result>