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The Third Youngest is a puzzle in Professor Layton and the Unwound Future.

Puzzle

US Version

"There are 10 siblings living together. Luke, let's say you're the eighth child. The oldest daughter is the second son's younger sister and the third son's older sister. The fourth son is the second daughter's older brother and the oldest daughter's little brother. There are no boys in between the third and fourth daughters. Got all that?"

Is the third-youngest child a boy or a girl?

UK Version

"10 close brothers and sisters live together. Now Luke, let's imagine that you're the eighth child.
The oldest daughter is the second son's younger sister and the third son's older sister. The fourth son is the second daughter's older brother and the oldest daughter's younger brother. There are no boys in between the third and fourth daughters.
Is the third child from the bottom a boy or a girl?"
"I can't tell just from this!"
Let's tell Luke the answer in secret.

Hints




Click a Tab to reveal the Hint.

US Version

You weren't confounded by that circumlocutory explanation, were you?

Read the puzzle again from the very beginning.

UK Version

You weren't confounded by that roundabout explanation, were you? Read the puzzle again from the very beginning.

US Version

Is trying to comprehend all of those conditions too much of a pain?

If you're thinking that way, here's a word to the wise: this is actually a very simple puzzle...

UK Version

Is reading all the conditions of the puzzle proving too much of a pain?

If you've started thinking that way, then you should know that this is a VERY simple puzzle!

US Version

Out of the 10 siblings, Luke is the eighth child...

How many siblings are younger than Luke?

UK Version

Out of the 10 brothers and sisters, Luke is the eighth child "from the top".

If this is the first condition of the puzzle, then...

US Version

Out of the 10 siblings, the third-youngest child is the same as the eight!

And Luke certainly isn't a girl, so...

UK Version

Out of 10 brothers and sisters, third from the bottom is eighth from the top.

Luke certainly isn't a girl...

"I think you know the answer now, Luke!"


Solution

Incorrect

US Version

Too bad!

Simplify your thinking as much as possible.

UK Version

Too bad.

Try to think of things as simply as possible.

Correct

US Version

Correct!

At the beginning, Luke was named as the eighth child. The puzzle is asking for the gender of the third child from the bottom, and since there are 10 siblings in total, the third from the bottom is the same as the eighth from the top!

And of course Luke is a boy!

UK Version

That's right!

It's a boy.

"I told you at the beginning, Luke:
"Let's imagine that you're the eighth child."

My question was asking about the third child from the bottom, or in other words, the eighth oldest child. That eighth child was you, Luke, and I know better than anyone that you're a boy!"

UF070S

A big thanks to http://professorlayton3walkthrough.blogspot.com

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