Sun=0, Mon=1,.... Here is what I did, and I obtained the correct answer; however, I think this should have been done another way. In 129 days, it will be Friday.
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Every 7 days, you get back to Tuesday. Since that means that it will be days after Tuesday. So the day you'll be on is Friday.
Originally Posted by Prove It Every 7 days, you get back to Tuesday. Since that means that it will be days after Tuesday. So the day you'll be on is Friday. To explain Prove It's method a bit further, you're seeking such that and . can be found through the division algorithm.