Brain Teaser 1

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Brain Teaser 1
A 30 year old man married a 25 year old woman.
She died at age 50 and her husband was so
devastated that he cried for years. Ten years
after he stopped crying, he died. If he had
lived to be 80. How many years was he a
widower?

www.mathsrevision.com
He was a widower for 25 years. !
2
Brain Teaser 2
If Susan is 10, Arabella is 20, and Jim and Neal
are both 5, but Richard is 10. How much is
Jennifer by the same system?
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Jennifer is fifteen, in a system that awards
five for each syllable.
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Brain Teaser 3
If 2 hours ago it was as long after one o'clock
in the afternoon as it was before one o'clock in
the morning. What time would it be now?
www.mathsrevision.com
Nine o'clock. Since there are 12 hours between
the 2 times and  half of that time is six, then
the halfway mark would have to be 7 o'clock. If
it were 7 o'clock, two hours ago, the time would
now  be nine o'clock.
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Brain Teaser 4
I am eight letters long - "12345678"  My 1234 is
an atmospheric condition.  My 34567 supports a
plant.  My 4567 is to appropriate.  My 45 is a
friendly thank-you.  My 678 is a name.  Q
What word am I?
www.mathsrevision.com
MISTAKEN
5
Brain Teaser 5
Two boxers are in a boxing match (regular
boxing, not kick boxing). The fight is scheduled
for 12 rounds but ends after 6  rounds, after
one boxer knocks out the other boxer. Yet no
man  throws a punch. How is this possible? 
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They are female boxers.
6
Brain Teaser 6
Two mothers and two daughters were fishing. They
managed to catch  one big fish, one small fish
and one fat fish. Since only three fish were
caught. How is it possible that they each took
home a fish?
www.mathsrevision.com
The fishing party consisted of three people. A
grandmother, a mother, and a daughter. The
mother is both a mother and a  daughter. 
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Brain Teaser 7
If you were to put a coin into an empty bottle
and then insert a cork into the neck How could
you remove the coin without taking out the cork
or breaking the bottle?
www.mathsrevision.com
Simply push the cork into the bottle and shake
the coin out. 
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Brain Teaser 8
What is at the beginning of eternity, the end of
time, the  beginning of every end and the end
of every place?
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"e"
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Brain Teaser 9
A snail is at the bottom of a well 30 feet deep.
It crawls up 3 feet each day, but at night, it
slips down 2 feet. How long  does it take for
the snail to crawl out the well?
www.mathsrevision.com
28 days. Once it reaches the top, it does not
slip down 2 feet. 
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Brain Teaser 10
A boy leaves his house one summer day and began
to run  into the woods to his grandmother's house
which is on the other  side of the woods. It
should also be known that the boy reached  his
grandmother's house. How far did the boy run
into the woods?

www.mathsrevision.com
Halfway. Because once you reach the middle, you are then running out of the woods. 
11
Brain Teaser 11
You want to send a valuable object to a friend.
You have a box  which is more than large enough
to contain the object. You have several locks
with keys. The box has a locking ring which is
more than large enough to have a lock attached.
But your friend does not have the key to any lock
that you have. Note that you cannot send  a key
in an unlocked box, since it might be copied.
How is this done?
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Attach a lock to the ring. Send it to her. She
attaches her own lock and sends it back. You
remove your lock and send it back to her. She
removes her lock.
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Brain Teaser 12
You have two egg timers a 4-minute egg timer and
a 7-minute egg timer.  You want to measure 9
minutes. How do you do it?
Start both egg timers. When the 4-minute timer
runs out, turn it over (4 minutes elapsed). When
the 7-minute timer runs out, turn  it over (7
minutes elapsed). When the 4-minute timer runs
out this time (8 minutes elapsed), the 7-minute
timer has been running for 1 minute. Turn it over
once again. When it stops, 9 minutes have 
elapsed.
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13
Brain Teaser 13
If there are fifteen crows on a fence and the
farmer shoots a  third of them. How many are
left?
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None they all flew away with noise of the gun.
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Brain Teaser 14
The Lone Ranger rode into town on Friday. He
stayed 5 consecutive   days and left on Friday.
How could this be? 
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Friday was the name of his horse.
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Brain Teaser 15
How much dirt is in a hole that is 3 ft deep and
6 inches in diameter? 
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None. A hole only has air in it, no dirt. 
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Brain Teaser 16
How many times can you subtract the number 5
from 25?
www.mathsrevision.com
Once. After the first calculation, you will be
subtracting 5 from 20,  then 5 from 15, and so
on.
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Brain Teaser 17
There is a man that lives on the top floor of a
very tall  building.  Everyday he gets the
elevator down to the ground floor to leave the
building to go to work.  Upon returning from work
though, he  can only travel half way up in the
lift and has to walk the rest of the way, unless
it's raining!  WHY?
www.mathsrevision.com
The man was a dwarf and couldn't reach top lift
buttons except with an umbrella.
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Brain Teaser 18
A man is wearing black. Black shoes, socks,
trousers, jumper,  gloves, and balaclava.  He
is walking down a black street with all the
street lamps off.  A black car is coming toward
him  with its lights off too, but somehow
manages to stop in time.  How  did the driver
see the man?
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It was day time.
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Brain Teasers 19
Is half of two plus two equal to two or three?
www.mathsrevision.com
Three. It seems that it could almost be either,
but if you follow the mathematical orders of
operation, division is performed before addition.
So... half of two is one. Then add two, and the
answer is three.
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Brain Teaser 20
How would you rearrange the letters in the words
new door to make one word? There is only one
correct answer. 
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One Word!