20. In block and tackle system consisting of odd number of pulleys, the number of pulleys in the block is _________ more than number of pulleys in tackle.
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In the block & tackle system, the number of pulleys in the movable lower block is either equal to or one less than the number of pulleys in the fixed upper block.
It is a mixture of pulleys and rope, that can change the direction of the force applied or lift heavy weights.
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