Question

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:


Options:
A .  90 cm
B .  1 dm
C .  1 m
D .  1.1 cm
Answer: Option B

Let the thickness of the bottom be x cm.

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

A Cistern Of Capacity 8000 Litres Measures Externally 3.3 M ... 320 x 250 x (110 - x) = 8000 x 1000

A Cistern Of Capacity 8000 Litres Measures Externally 3.3 M ... (110 - x) = 8000 x 1000 = 100 320 x 250

A Cistern Of Capacity 8000 Litres Measures Externally 3.3 M ... x = 10 cm = 1 dm.


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