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0 / 60 seg.
There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?
T
H
_
R
_
_
R
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9
B
_
_
K
S
_
N
T
H
_
S
H
_
L
F
.
T
H
_
R
_
_
R
_
3
B
_
_
K
S
T
_
T
H
_
L
_
F
T
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N
D
5
B
_
_
K
S
T
_
T
H
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R
_
G
H
T
.
I
N
T
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T
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L
,
T
H
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R
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_
R
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3
+
5
+
1
B
_
_
K
S
Clue
FOUR. THE FOUR FATHERS COULD BE GRANDFATHERS AND ARE DEFINITELY SONS ALREADY
THERE ARE 9 BOOKS ON THE SHELF. THERE ARE 3 BOOKS TO THE LEFT AND 5 BOOKS TO THE RIGHT. IN TOTAL, THERE ARE 3 + 5 + 1 BOOKS
11 PEOPLE WERE IN THE LIBRARY. WE HAVE 2 EYES EACH, AND THERE WAS NO MENTION ABOUT THE PAIRS OF EYES. SO WE HAVE 10 PEOPLE IN ADDITION TO THE MAN WHO DROPPED THE BOOK. HE CAN'T LOOK AT HIMSELF, BUT HE'S STILL IN THE LIBRARY
FIVE. THERE ARE ONLY FOUR COLORS, SO FIVE SOCKS WILL GUARANTEE THAT TWO WILL BE THE SAME COLOR
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