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If yesterday were tomorrow, then today would be Friday. What day is today?

  • A.Saturday
  • B.Monday
  • C.Sunday
  • D.Tuesday

Answer: C

Let today be \( D \). Yesterday is \( D - 1 \).

Suppose that day were tomorrow instead. If \( D - 1 \) is tomorrow, then "today" in that shifted week is \( D - 2 \), and we are told it would be Friday:

\[ D - 2 = \text{Friday} \quad\Longrightarrow\quad D = \textbf{Sunday} \]

Checking: if today were Sunday, yesterday was Saturday; treating Saturday as tomorrow puts today at Friday, as required.

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