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25cm x 25cm = 625cm
on a ruler 1cm is divided in to 10mm (so is 1 x 10) so 25cm x 10 = 250mm
25cm x 4 sides = 100 cm perimeter
35*50*90 = 157500 cubic cm
The volume of the tank is 51cm x 25cm x 31cm = 39525cm3 1 litre = 1000cm3 ⇒ divide 39525cm3 by 1000 convert to litres ⇒ 39.525 litres.