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 :
Answer: Option B
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Let the thickness of the bottom be `x` cm.
Then , [ ( 330 - 10) x ( 260 - 10) x (110 - `x`)] = 8000 x 1000
`hArr ` 320 x 250 x (110 - `x` ) = 8000 x 1000.
`hArr (110 - x)` =` (8000 xx 1000)/(320 xx 250)` = 100.
`hArr (110 - x ) = 100`
`hArr x = 10 cm` = 1 dm,.
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