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A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:

90 cm
1 dm
1 m
1.1 cm

Correct Answer: 1 dm

Explanation:

Let the thickness of the bottom be x cm.

Then, [(330 - 10) x (260 - 10) x (110 - x)] = 8000 x 1000

⟹ 320 x 250 x (110 - x) = 8000 x 1000

⟹ (110 - x) =	8000 x 1000	= 100
	320 x 250

⟹ x = 10 cm = 1 dm.

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