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Puzzle
- US Version
Below are three siblings: A, B, and C.
A: "I have one older brother and three younger sisters."
B: "I have two older brothers and two younger sisters."
C: "I have three older brothers and one younger sister."
For all of their statements to be true, what's the smallest possible number of siblings there can be in the family?
- UK Version
There are three siblings: A, B and C.
A: "I have one older brother and three younger sisters."
B: "I have two older brothers and two younger sisters."
C: "I have three older brothers and one younger sister."
Given that all their statements are true, what is the lowest possible number of siblings in this family?
Hints
Click a Tab to reveal the Hint.
Solution
Incorrect
Too bad!
- US Version
It's not as simple as it might seem at first glance.
- UK Version
Remember that you want to find the minimum number of siblings.
Correct
- US Version
Right on!
The smallest possible number of siblings is six.
At first glance, it might seem like there are only five. But the fact that A says he has three younger sisters means there must be at least three female siblings. Likewise, the fact that C says she has three older brothers means there must be at least three male siblings. So five siblings isn't quite enough.
- UK Version
Bang on!
The lowest possible number of siblings is six.
At first glance, it might seem like there are only five. But the fact that A says he has three younger sisters means there must be at least three female siblings. Likewise, the fact that C says that she has three older brothers means there must also be at least three male siblings, so five siblings isn't quite enough.
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