Been a while since I tried to work out a riddle. I came across this one on a site, which said I would get some, $200 worth of clams if I solved it and sent the answer in, without Googling. Of course there was no e-mail address. Interesting blog, though, some of those recipes look good. (seedmore.org)
Anyway, here’s the riddle, and below the spacer is my thought process to come up with the answer. Took about 10 minutes.
RIDDLE
Rick is a strange liar. He lies on six days of the week, but on the seventh day he always tells the truth. He made the following statmenets on three successive days:
Day 1: “I lie on Monday and Tuesday”
Day 2: “Today, it’s Thursday, Saturday, or Sunday.”
Day 3: “I lie on Wednesday and Friday.”
The questions: On which day does Rick tell the truth?
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Okay, here’s where I’d usually do the “click Next to find the answer!” but I don’t use that formatting for this blog, and I’m not quite sure how to add it to just this post. Anyway, the riddle is solvable, so if you’re feeling nerdy, write it up and don’t look below.
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“Thought Process for Solving Riddle”
Let’s figure this out.
Rick only tells the truth 1 day out of the week. That either means a) all 3 of the statements are lies, or b) one of the statements is true. (so b1, b2, b3)
Break down a). All are lies.
Many ways to read these statements. The wrong way would be to construe the first statement, “I lie on Monday and Tuesday”, as “I lie on Wed-Sun”.
Specifically, lying about “I lie on Monday and Tuesday” would mean that he tells the truth on Monday or Tuesday. Hm, well what about Day 3 then? “I lie on Wednesday and Friday” Doesn’t one of those two have to be true?
For simplicity’s sake, let’s just go with that. Day 1 or 3 is true, the other one is a lie. And Day 2 has to be a lie.
We’ll go onto b).
Day 1 — Truth or Lie
Day 2 — Lie
Day 3 — Truth or Lie (opposite of 1)
Day 2 = Lie means that Day 2 is either Monday, Tuesday, Wednesday or Friday.
Scenario 1: Truth Day is Day 1, which is a Sunday.
If Day 2 were Monday, Day 1 would be Sunday, and Day 3 would be Tuesday. Let’s break it down into Day 1/3. Day 1 = Lie (that means he tells the truth on either Monday or Tuesday). Day 3 = Truth (Wednesday and Friday are both out). Then Monday/Tuesday can’t be truth days, because there would be 2 truth days. (Wrong)
Scenario 2: Truth Day is Day 1, which is a Monday.
Day 2 = Tuesday, Day 3 = Wednesday. Only 1 Truth day, Monday, so Tuesday and Wednesday are lie-days. This can’t happen, because Day 3 truth = Wednesday and Friday lies. (Wrong)
Scenario 3: Truth Day is Day 1, Tuesday.
Day 2 = Wednesday, Day 3 = Thursday. Yet again, Truth day cannot be Tuesday because that would go against Day 3’s statement (Wednesday and Friday have to be truth days). Seeing a pattern here, but it’s late so I’ll continue.
Scenario 4: Truth Day is Day 1, Thursday.
Day 2 = Friday. Again, Day 3 annuls this point, because Wed/Fri are both lies. Onto the next set of 4 scenarios.
Scenario 5: Truth Day is Day 3, Tuesday.
Day 2 = Monday, Day 1 = Sunday. Huh, I’m confused. If truth day is Tuesday, then why didn’t the first scenario work out? Well.. the dates were wrong I guess.. oh well let’s just trudge on.
Scenario 6: Truth Day is Day 3, Wednesday.
Day 2 = Tuesday, Day 1 = Monday. Doesn’t work because if Truth Day were Wednesday it’d annul point 3. He can’t lie on Wednesday Day 3
Scenario 7: Truth Day is Day 3, Thursday.
Day 1 = Tuesday, Day 2 = Wednesday. Day 1 Tuesday = lie doesn’t work, because the lie is on Thursday, not Mon/Tues.
Scenario 8: Truth Day is Day 3, Saturday.
Day 1 = Thursday, Day 2 = Friday. Again, doesn’t work, because if Day 1 were a lie, then Monday or Tuesday would have to be a truth day.
So I’m going to conclude with Tuesday. I’m not sure why the first run around didn’t conclude Tuesday, but it works as so:
Day 1 (Sunday): I lie on Monday or Tuesday — LIE (he tells the truth on Tuesday)
Day 2 (Monday): Today it’s either Thursday, Saturday, or Sunday — LIE (it’s Monday)
Day 3 (Tuesday): I lie on Wednesday and Friday — TRUTH (he does lie on Wed/Fri).
Hope this is correct, going to google it.
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Yay, I’m right!








