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Logic
Zoo
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Dan, Jen, Keith, and Mia are having an argument
about which animals to visit first at the zoo —
the deer, the lions, the leopards or the giraffes.
Each kid wants to see his or her favorite animal
first. Dan is allergic to cats, so he doesn't like
animals that are in the cat family. Jen's favorite
animal doesn't have horns. Keith doesn't care for
animals that have spots. Mia disagrees with both
Dan and Keith. Which is each kid's favorite animal?
Dan's favorite animal is the giraffe, Jen's is the
leopard, Keith's is the lion, Mia's is the deer.
To get the answer, make a chart like this:
deer
lion
leopard
giraffe
Dan
x
x
Jen
x
x
Keith
x
x
Mia
YES
Make an X in the boxes that can't be right.
You can see that Mia's favorite animal is
the deer, because she disagrees with both Dan
(about cats) and Keith (about spots), so put
a ( in the deer box in Mia's row.
Now make an X in all the other 3 boxes in
Mia's row.
You'll find that Dan's favorite must be the
giraffe, because that's the only possible box
left in the giraffe column.
Make an X in the deer box in Dan's row, because
you know his favorite is the giraffe.
Continue eliminating possibilities in this
way until you have one check in each column
and one check in each row.
