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0 / 60 seg.
If Mr. Flynn is 90 centimetres plus half his height, how tall is he?
1
8
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C
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N
T
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M
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T
R
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S
.
H
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L
F
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F
H
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S
H
_
_
G
H
T
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S
9
0
C
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N
T
_
M
_
T
R
_
S
.
T
H
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R
_
F
_
R
_
H
_
S
F
_
L
L
H
_
_
G
H
T
H
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S
T
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B
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D
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B
L
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F
T
H
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T
Clue
180 CENTIMETRES. HALF OF HIS HEIGHT IS 90 CENTIMETRES. THEREFORE HIS FULL HEIGHT HAS TO BE DOUBLE OF THAT
THE PROBABILITY IS 1/2. THERE ARE INITIALLY 4 POSSIBILITIES: GIRL-GIRL, GIRL-BOY, BOY-GIRL AND BOY-BOY. SINCE THE OLDER CHILD IS A BOY, WE CAN RULE OUT THE GIRL-GIRL AND GIRL-BOY COMBINATIONS
HE IS 16 YEARS OLD. WHEN I WAS 4 YEARS OLD, MY BROTHER WAS 2 YEARS OLD (HALF MY AGE), SO MY BROTHER IS 2 YEARS YOUNGER THAN ME. WHEN I AM 18 YEARS OLD, MY BROTHER WILL BE 16 YEARS OLD AS HE IS 2 YEARS YOUNGER THAN ME
THE BOOK COSTS $2. LET THE COST BE X. WE KNOW THAT: X = 1 + X/2 SOLVING FOR X WILL GIVE 2
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