- A boy got bored of the class and started walking on
a hall which contained 1024 lockers in a row. He first
opened locker 1 and alternatively left one and opened
one from thereon. When he reached the end he turned
back and opened the first closed locker and from
thereon continued what he did previously. He did this
back and fro method till he opened the last locker.
What is the number of the last locker he opened?
- Two mathematicians met after 27 years in their
college. This was their conversation.
First: How are you doing?
Second: Fine I got married and have three daughters.
First: Fine. I also got married 2 years after the
college. How old are your daughters?
Second: Well, Product of their ages is 72 and their
sum is equal to that house number (It was not
First: Wait, I am still counting.
Second: Sorry, youngest of them has just started
First: Is it! Youngest of mine is also of the same
How old are the three daughters?
- In the 2nd world war Japan’s war ship named J was
followed by the USA war ship U which is traveling at
100kmph. By the time U was beside J and ready to
launch the torpedo, the place was surrounded by fog
and the army-general in U could not see anything.
Taking this as a chance J changed in direction at an
angle. After 6min the general in U realized it and
informed the helicopter over it to find J. After 3
minutes the helicopter replied that J turned at an
angle 45 degrees and was 5km away from U at the time
when the general asked for it. The intelligent general
quickly turned U and successfully caught J.
How much time “U” would have taken to catch “J”?
- There is a temple on the top of the hill of height
1000mtrs.Coconuts at the base of the hill are sold at
5/- each and at the top of the hill at 50/- each. One
intelligent businessman thought of buying coconuts at
the base and selling them at the top. For that he
appointed 2 people who can carry only 1000 coconuts at
a time and takes 1 coconut for every mtr of walk.
Can he succeed in his plan. If yes how much profit he
earns for a rupee of investment?
- There is bag containing balls of three colors-Red,
Green and Yellow and there are three color blind
people A, B and C.
For A Red is invisible and every other color
For B Green is invisible and every other color
For A Yellow is invisible and every other color
They were shown the box and when asked the question
what can see their replies were
A: I can see two balls.
B: I can see two balls.
C: I can see two balls.
How many balls were there in the box and of what
- There is a farm which contains super hens which r
genetically made to lay eggs of double size than the
normal ones. But as genetic engg. is not well
understood there is only 50-50% chance of a super hen
laying large egg.
The farm is such tht it keeps the hen as long as
it lays large eggs and removes the hen out of the farm
as soon as it lays one normal egg.
The farm followed the same process for one year
and counted all the eggs laid by all the super hens.
At the end of the year the ratio of large eggs to the
normal ones is?
- There are 8 stamps, 4 Red and 4 Green. There are
three logicians also. One moderator sticks thow stamps
each on the forhead of each logician such that each of
them can see all the stamps except those on his
forhead and the two in moderator's pocket. Then the
moderator asked each whether he knows the colors of
the stamps he wears? Then the answeres were:
A: "No" B: "No" C: "No"
A: "No" B: "Yes"
What were the colours of the stamps that B wears?
- There's a camel living in a desert. There is a
market 1000 miles away. The camel has 3000 dates for
sale. It has to take the date to the market. But for
that hte camel eats one date per mile. How many dates
the camel can trade?
- There are following denominations of money: 1, 2,
5, 10, 20, 50, and 100 paise. Alex has as twice mony
as David, who has as twice as Bindya, who again has as
twice money as Charles. Each has two coins in hand.
Which coins Bindya has?
- There are Brown and Black cows. In five days four
black cows and 3 brown cows give as mush as milk that
four brown cows and 5 black cows give in four days. If
the black cow gives 10 litres of milk per day, how
many liters of milk the Brown cow will give in one
day?(Numbers are not certain)
- One guy (some name) has Rs. 100/- in hand. He has
to buy 100 balls. One football costs Rs. 15/, One
Cricket ball costs Re. 1/- and one table tennis ball
costs Rs. 0.25 He spend the whole Rs. 100/- to buy the
balls. How many of each balls he bought?
- U need 2 kill a dragon with 3 heads & 3 tails. u
have a magic sword dat can cut 1 head, 2 heads, 1
tail, or 2 tails in 1 swing.
if 1 head is cut -> a new head grows
if 1 tail is cut -> 2 tails grow
if 2 tails r cut -> 1 head grows
if 2 heads r chopped -> nothing grows. What is d min.
num of swings 2 b made?
- Slow train runs b/w Blore & Mumbai, up as well as
down. It starts at 10:00pm everyday & reaches
destination by 11:30pm after 3 days. If u travel by
Slow train, how many such trains will u encounter
- A num of birds, black & white, r sitting on thhe
tele wire. There is at least 1 bir of each color, also
whenevr 2 birds are seperated by 4 or 7 other boirds
of any color, both birds r of same color. Wot is the
max. num of birds dat can b seated in this fashion?
- 5 ppl, A, B, C, D, E are supposed 2 cover a certain
distance from their car to a house. There is only 1
umbrela dat can b shared by 2 ppl at a time.
It takes 1min for A 2 cover the dist, B->2 min,
C->5min, D->10min, E->15min.
Wot is d quickest poss time 4 the entire grp 2 get
into the house?
- Mr.X belongs 2 a grp of 8 ppl including himself. In
d meeting, nobody shakes hands with the same person
more than once but everyone shakes hands with at least
After the meeting is over, Mr.X realizes dat all the
other ppl in the party had shook a diff num of hands.
How many hands did Mr.X shake?
- Old Man Wrinkle
Man Wrinkle spent one-fourth of his life as a boy,
one-eighth as a youth, and one-half as an active man.
If Man Wrinkle spent 8 years as an old man, then how
many years did he spend as an active man?
- A farmer has C chickens.A sack of feed comes for 9
days.As the feed cost is increasing the
farmer sells some chickens and retains 12 chicken.If
he reduces the feed quantity by 10% .Then
he observesthat the feed comes for 30 days.What is C?
- The Carpenter and the Nails
A 31" x 31" square metal plate needs to be fixed by a
carpenter on to a wooden board. The carpenter uses
nails all along the edges of the square such that
there are 32 nails on each side of the square. Each
nail is at the same distance from the neighboring
nails. How many nails does the carpenter use?
- Vacation time
It was vacation time, and so I decided to visit my
cousin's home. What a grand time we had! In the
mornings, we both would go for a jog. The evenings
were spent on the tennis court. Tiring as these
activities were, we could manage only one per day,
i.e., either we went for a jog or played tennis each
day. There were days when we felt lazy and stayed home
all day long.
Now, there were 12 mornings when we did nothing, 18
evenings when we stayed at home, and a total of 14
days when we jogged or played tennis. For how many
days did I stay at my cousin's place?
- Monkeys and bananas:
Suppose 8 monkeys take 8 minutes to eat 8 bananas.
(a) How many minutes would it take 3 monkeys to eat 3
bananas?(b) How many monkeys would it take to eat 48 bananas
in 48 minutes
- Glenn and Jason each have a collection of cricket
balls. Glenn said that if Jason would give him 2 of
his balls they would have an equal number; but, if
Glenn would give Jason 2 of his balls, Jason would
have 2 times as many balls as Glenn. How many balls
does Jason have?
- A set of football matches is to be organized in a
"round-robin" fashion, i.e., every participating team
plays a match against every other team once and only
If 21 matches are totally played, how many teams
- Gold coins:
A rich merchant had collected many gold coins. He did
not want anybody to know about them. One day, his wife
asked, "How many gold coins do we have?"
After pausing a moment, he replied, "Well! If I divide
the coins into two unequal numbers, then 37 times the
difference between the two numbers equals the
difference between the squares of the two numbers."
The wife looked puzzled. Can you help the merchant's
wife by finding out how many gold