Suppose three days ago was Tuesday. What day of the week will it be 90 days from today?
a. Monday
b. Thursday
c. Friday
d. Saturday
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If, according to the problem, it was Tuesday three days ago, then today must be Friday. The days of the week repeat in sets of 7. If today is Friday, then 91 days from now will be Friday as well, since 91 is a multiple of 7. Thus, 90 days from now will be the day before Friday, or Thursday.
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