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