
Stephen K. answered 09/12/14
Tutor
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(798)
Physics PhD experienced in teaching undergraduates
Sasha,
Tuesday + 7 days (1 week) = Tuesday, so Tuesday + 7 days - 1 day = Tuesday - 1 day = Monday
Now Monday + 1 week = Monday, so Monday + 1 week = 1 day = Tuesday.
Another way to look at the problem is if Tuesday was 6 day ago and we want to know what day it will be in 8 more days, then we have:
Last Tuesday + 14 days = Tuesday + 2 weeks = Tuesday.