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810 = 5x . 3x . 2x
810 = 30x^3
810/30 = x^3
27 = x^3
3 = x
p = 5 . 3 = 15
l = 3 . 3 = 9
t = 2 . 3 = 6
L = 2 ( pl + lt + pt)
= 2 ( 15.9 + 9.6 + 15.6)
= 2 ( 135 + 54 + 90)
= 558