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0 / 60 seg.
If Mr. Flynn is 90 centimetres plus half his height, how tall is he?
1
8
0
C
_
N
T
_
M
_
T
R
_
S
.
H
_
L
F
_
F
H
_
S
H
_
_
G
H
T
_
S
9
0
C
_
N
T
_
M
_
T
R
_
S
.
T
H
_
R
_
F
_
R
_
H
_
S
F
_
L
L
H
_
_
G
H
T
H
_
S
T
_
B
_
D
_
_
B
L
_
_
F
T
H
_
T
Clue
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
THE JAR WILL BE HALF FULL IN 59 MINUTES. A MINUTE LATER, IT WILL DOUBLE AND WILL FILL THE JAR
FOUR BROTHERS AND THREE SISTERS. EVERY BOY WILL HAVE 3 BROTHERS AND 3 SISTERS. EVERY GIRL WILL HAVE 4 BROTHERS AND 2 (HALF OF THE NUMBER OF BROTHERS) SISTERS
180 CENTIMETRES. HALF OF HIS HEIGHT IS 90 CENTIMETRES. THEREFORE HIS FULL HEIGHT HAS TO BE DOUBLE OF THAT
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