Tie a box with a ribbon, the first one is 235cm, the second one is 445cm, and the third one is 5 15cm, and each joint is 5cm. Find the box volume.
Let the length, width and height of the box be x, y and z respectively. The length of the first root is 235 = 2 * (x+y); The length of the second root is 2 * (x+z); The third root is 5 15=2*(Y+Z). Three agenda expressions can be obtained: x+y =115; x+Z = 220； Y+Z=255. The solution is x = 40Y = 75Z= 180. So the volume is X*Y*Z=540000.
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