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We known L:B:H = 5:3:6. Let it be 5u : 3u : 6u.
Perimeter = 2 x (L + B) = 2 x (5u + 3u) = 16u = 64. So u = 4.
Volume of tank = 5u x 3u x 6u = 5 x 4 x 3 x 4 x 6 x 4 = 5760 cm3.

 

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