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This picture is taken from the Problem Pictures Numbers resource of photographs with activities for mathematics teaching.
If you purchase this resource the photographs are available in higher resolution and there are additional pages containing hints and solutions.
Screw pump
As the pump turns, water is raised to the top. This type of pump has been used for more than two thousand years.
Which way would you turn the pump to bring water to the top?
If the volume of water travelling up the pump is 16 litres, how much water is produced by turning the pump one revolution?
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