If this is what you are asking: Ms. Cole has 4 yards of string. She cuts the string into pieces that are each 12 yards long. How many pieces of string does Ms. Cole have?
Then your answer is: She has 1/3 of a piece of string.
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If this is what you are asking: Ms. Cole has 4 yards of string. She cuts the string into pieces that are each 12 feet long. How many pieces of string does Ms. Cole have?
Then your answer is: She has 1 piece of string.
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If this is what you are asking: Ms. Cole has 4 yards of string. She cuts the string into pieces that are each 12 inches long. How many pieces of string does Ms. Cole have?
Then your answer is: She has 12 pieces of string.
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I am not exactly sure if this is what you are looking for. If you need anything else, don't hesitate to ask :D