Riddles
Go to...
Index
Translations
Pronunciation
Images
Computers
Geography
Languages
0 / 60 seg.
There was a small get-together. There were a total of 28 handshakes exchanged between the guests. How many guests were present?
T
H
_
R
_
W
_
R
_
8
G
_
_
S
T
S
.
I
F
T
H
_
R
_
_
R
_
2
G
_
_
S
T
S
,
T
H
_
R
_
W
_
L
L
B
_
1
H
_
N
D
S
H
_
K
_
.
S
_
,
2
G
_
_
S
T
S
,
1
H
_
N
D
S
H
_
K
_
3
G
_
_
S
T
S
,
2
H
_
N
D
S
H
_
K
_
S
3
G
_
_
S
T
S
,
3
H
_
N
D
S
H
_
K
_
S
4
G
_
_
S
T
S
,
6
H
_
N
D
S
H
_
K
_
S
W
_
T
H
T
H
_
S
,
F
_
R
N
G
_
_
S
T
S
,
W
_
W
_
L
L
H
_
V
_
(
N
(
N
-
1
)
)
/
2
H
_
N
D
S
H
_
K
_
S
Clue
HIS BIRTHDAY IS ON DECEMBER 31. HE MADE THE STATEMENT ON JANUARY 1. ON THE DAY BEFORE YESTERDAY (DECEMBER 30) HE WAS 25. HE TURNED 26 ON DECEMBER 31. THAT YEAR, HE WOULD TURN 27, SO THE "NEXT YEAR" HE WOULD TURN 28
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
9 TEENAGERS CAN EAT 18 PIZZAS IN 3 DAYS. 1 TEENAGER CAN EAT 1 PIZZA IN 1.5 DAYS. 1 TEENAGER CAN EAT 2 PIZZAS IN 3 DAYS. 9 TEENAGERS CAN EAT 18 PIZZAS IN 3 DAYS
THERE WERE 8 GUESTS. IF THERE ARE 2 GUESTS, THERE WILL BE 1 HANDSHAKE. SO, 2 GUESTS, 1 HANDSHAKE 3 GUESTS, 2 HANDSHAKES 3 GUESTS, 3 HANDSHAKES 4 GUESTS, 6 HANDSHAKES WITH THIS, FOR N GUESTS, WE WILL HAVE (N(N-1))/2 HANDSHAKES
Text
Audio
Text & audio
Free text
Multiple option
Previous question
Start
Next question
Please enable JavaScript to continue using this application.