Teacher Li made a rectangular parallelepiped frame with 240cm iron wire. The ratio of length, width and height is 7:5:3. How many square centimeters does this rectangular parallelepiped occupy?
李老师用240厘米的铁丝做了一个长方体的框架，长、宽、高的比是7：5：3，这个长方体的占地面积是多少平方厘米？
<gadget id="calculator">240 / 4</gadget>
<output>60</output>

<gadget id="calculator">7 + 5 + 3</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">60 * (7/15)</gadget>
<output>28</output>

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">60 * (1/3)</gadget>
<output>20</output>

<gadget id="calculator">28 * 20</gadget>
<output>560</output>

<result>560</result>