In a flower bed with a length of 4 meters and a width of 15 meters, if 2 roses are planted per square meter, how many roses can be planted in the flower bed?
在一块长4米，宽15米的花坛里，按1平方米栽2棵玫瑰花来计算，花坛里能栽多少棵玫瑰花？
<gadget id="calculator">4 * 15 * 2</gadget>
<output>120</output>

<result>120</result>