three types xy&z can fill a tank in 18 24 and 36 hours respectively x is opened first and y is opened after time t and z is opened after 2t measured from the time x was opened,hours after y is opened?
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The circular head of the screw gauge is divided into 20 divisions and the screw moves 1 mm ahead in two rotations of the head of the screw. Find its least count
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Answer:4.5
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