Asked by Tracy

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?
Answered by MathMate
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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