Question
Rachel, Min and Lucy were each given a piece of ribbon of equal length. Rachel cut hers into equal lengths of 4 cm, Min cut hers into equal lengths of 5 cm, and Lucy cut hers into equal lengths of 10 cm. If there were no remainder in each case, find the shortest length of ribbon given to each of them.
4 m

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Rachel, Min and Lucy were each given a piece of ribbon of equal length. Rachel cut hers into equal lengths of 4 cm, Min cut hers into equal lengths of 5 cm, and Lucy cut hers into equal lengths of 10 cm. If there were no remainder in each case, find the shortest length of ribbon given to each of them.