The length, breadth and height of a cuboid are in the ratio 2:4:2. If its volume is 9000m3, find its surface area.
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Let l,b,h be 4x,2x,x
TSA=2(lb+bh+hl)
1372=2(8x2+2x2+4x2)
686=14x2
49=x2 so x=7
l,b,h = 28,14,7
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