To determine how many friends were called on Sunday, let's break down the situation step by step.
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On Friday: Sharon called 3 friends.
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On Saturday: Each of those 3 friends called 3 different friends.
- So, total friends called on Saturday = \(3 \text{ friends} \times 3 \text{ calls each} = 9 \text{ friends}\).
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On Sunday: Each of the 9 friends who were called on Saturday called 3 different friends.
- So, total friends called on Sunday = \(9 \text{ friends} \times 3 \text{ calls each} = 27 \text{ friends}\).
Finally, the total number of friends who were called on Sunday is 27.