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Stephanie received twenty-one email messages. Three of them were from her mother. What fraction of the messages were not from her mother?

Can you please provide the answer in numeric form?

  • Math -

    Use the same strategy as the dress problem.
    Messages from her mother = 3
    Messages in all = 21
    Messages NOT from her mother = 21-3=18
    So fraction of messages NOT from her mother = 18/21 = 6/7

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