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A rectangular water reservoir contains 42000 litres of water. Find the depth of the water in the reservoir if its base measures 6m by 3.5m.

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1000 l = 1' cubic m
'42000 l = 42000 /1000' cubic m
= '42' cubic m
Volume = '42 'cubic cm
I b h = '42'
'6×3.5× h = 42'
'h = 2 m'
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