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I recently returned from a trip. Today is Friday. I returned four days before the day after the day before tomorrow. On what day did I return?
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Clue
I RETURNED ON TUESDAY. THE DAY BEFORE TOMORROW IS TODAY, FRIDAY. THE DAY AFTER THAT IS SATURDAY, AND FOUR DAYS BEFORE SATURDAY IS TUESDAY
TODAY IS FRIDAY. THREE DAYS BEFORE WEDNESDAY IS SUNDAY. IF THE DAY AFTER TOMORROW IS SUNDAY, THEN TODAY IS FRIDAY
SUNDAY. WHEN THE DAY AFTER TOMORROW IS YESTERDAY, TODAY WILL BE THREE DAYS HENCE, JUST AS WHEN THE DAY BEFORE YESTERDAY WAS TOMORROW CARRIES US BACK THREE DAYS FROM NOW, WHICH MUST BE SUNDAY, TO BE MIDWAY BETWEEN THE TWO "TODAYS". ALTERNATIVELY, WE CAN REPHRASE THE RIDDLE TO: IN 3 DAYS WE WILL BE AS FAR FROM SUNDAY AS WE WERE FROM SUNDAY 3 DAYS AGO SUNDAY IS THE ONLY DAY THAT SATISFIES THAT
MONDAY. LET'S WORK BACKWARDS, IF TODAY IS SATURDAY, TOMORROW WOULD BE SUNDAY. WE CAN NOW REPHRASE THE QUESTION: "IF YESTERDAY (SUNDAY) WAS TOMORROW (SUNDAY), TODAY WOULD BE A SATURDAY." IF YESTERDAY IS SUNDAY, TODAY IS MONDAY
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