INFOSYS PLACEMENT PAPERS ----- Placement Paper 13

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PART 1

1). A beggr collects cigarette stubs and makes one ful
cigarette
with every 7 stubs. Once he gets 49 stubs . How many
cigarettes
can he smoke totally.
Ans. 8
2). A soldiar looses his way in a thick jungle at random
walks
from his camp but mathematically in an interestingg
fashion.
First he walks one mile east then half mile to north.
Then 1/4
mile to west, then 1/8 mile to south and so on making a
loop.
Finally hoe far he is from his camp and in which direction.
ans: in north and south directions
1/2 - 1/8 + 1/32 - 1/128 + 1/512 - and so on
= 1/2/((1-(-1/4))
similarly in east and west directions
1- 1/4 + 1/16 - 1/64 + 1/256 - and so on
= 1/(( 1- ( - 1/4))
add both the answers
3). hoe 1000000000 can be written as a product of two
factors
neither of them containing zeros
Ans 2 power 9 x 5 ppower 9 ( check the answer )
4). Conversation between two mathematcians:
first : I have three childern. Thew pproduct of their
ages is 36
. If you sum their ages . it is exactly same as my
neighbour's
door number on my left. The sacond mathematiciaan
verfies the
door number and says that the not sufficient . Then the
first
says " o.k one more clue is that my youngest is the
youngest"
Immmediately the second mathematician answers . Can you
aanswer
the questoion asked by the first mathematician?
What are the childeren ages? ans 2 and 3 and 6
5). Light glows for every 13 seconds . How many times
did it
between 1:57:58 and 3:20:47 am
ans : 383 + 1 = 384

6). 500 men are arranged in an array of 10 rows and 50
columns .
ALL tallest among each row aare asked to fall out .
And the
shortest among THEM is A. Similarly after resuming that to
their
originaal podsitions that the shorteest among each
column are
asked to fall out. And the longest among them is B . Now
who is
taller among A and B ?
ans A
7). A person spending out 1/3 for cloths , 1/5 of the
remsaining
for food and 1/4 of the remaining for travelles is left
with
Rs 100/- . How he had in the begining ?
ans RS 250/-
8). there are six boxes containing 5 , 7 , 14 , 16 ,
18 , 29
balls of either red or blue in colour. Some boxes
contain only
red balls and others contain only blue . One sales man
sold one
box out of them and then he says " I have the same number
of red
balls left out as that of blue ". Which box is the one he
solds
out ?
Ans : total no of balls = 89 and (89-29 /2 = 60/2 = 30
and also 14 + 16 = 5 + 7 + 18 = 30
9). A chain is broken into three pieces of equal
lenths
conttaining 3 links each. It is taken to a backsmith to
join into
a single continuous one . How many links are to tobe
opened to
make it ?
Ans : 2.
10). Grass in lawn grows equally thickand in a uniform
rate. It
takes 24 days for 70 cows and 60 for 30 cows . How many
cows can
eat away the same in 96 days.?
Ans : 18 or 19

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11). There is a certain four digit number whose fourth
digit is
twise the first digit.
Third digit is three more than second digit.
Sum of the first and fourth digits twise the third
number.
What was that number ?
Ans : 2034 and 4368

If you qualify in the first part then you have to
appear for
the second i.e the following part.

Part 2.

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1. From a vessel on the first day, 1/3rd of the
liquid
evaporates. On the second day 3/4th of the remaining
liquid
evaporates. what fraction of the volume is present at the
end of
the II day.
2. an orange galss has orange juice. and white glass has
apple
juice. Bothe equal volume 50ml of the orange juice is
taken and
poured into the apple juice. 50ml from the white glass is
poured
into the orange glass. Of the two quantities, the
amount of
apple juice in the orange glass and the amount of orange
juice in
the white glass, which one is greater and by how much?
3. there is a 4 inch cube painted on all sides. this
is cut
into no of 1 inch cubes. what is the no of cubes which
have no
pointed sides.
4. sam and mala have a conversation. sam says i am
vertainly not
over 40. mala says i am 38 and you are atleast 5 years
older
than me. Now sam says you are atleast 39. all the
sattements by
the two are false. How hold are they realy.
5. ram singh goes to his office in the city, every day
from his
suburbun house. his driver mangaram drops him at the
railway
station in the morning and picks him up in the evening.
Every
evening ram singh reaches the station at 5 o'clock.
mangaram
also reaches at the same time. one day ramsingh started
early
from his office and came to the station at 4
o'clock. not
wanting to wait for the car he starts walking home.
Mangaram
starts at normal time, picks him up on the way and takes
him back
house, half an hour early. how much time did ram singh
walk.
6. in a railway station, there are tow trains going. One
in the
harbour line and one in the main line, each having a
frequency of
10 minutes. the main line service starts at 5
o'clock. the
harbour line starts at 5.02a.m. a man goes to the station
every
day to catch the first train. what is the probability
of man
catchinhg the first train
7. some people went for vaction. unfortunately it rained
for 13
days when they were there. but whenever it rained
in the
morning, they had clean afternood and vice versa. In
all they
enjoyed 11 morning and 12 afternoons. how many days
did they
stay there totally
8. exalator problem repeat
9. a survey was taken among 100 people to firn their
preference
of watching t.v. programmes. there are 3 channels. given
no of

people who watch
at least channel 1
" " 2
" " 3
no channels at all
atleast channels 1and 3
" " 1 and 2
" " 2 and 3
find the no of people who watched all three.
10. albert and fernandes they have two leg swimming
race. both
start from opposite and of the pool. On the first leg,
the boys
pass each other at 18 mt from the deep end of the pool.
during
the II leg they pass at 10 mt from the shallow end of the
pool.
Both go at const speed. but one of them is faster.
each boy
rests for 4 sec to see at the end of the i leg. what
is the
length of the pool.
11. T H I S Each alphabet stands for
one
I S digit, what is the maximum
value T
-------------- can take
X F X X
X X U X
--------------
X X N X X
--------------

1. an escalator is descending at constant speed. A
walks down
and takes 50 steps to reach the bottom. B runs down and
takes 90
steps in the same time as A takes 10 steps. how many
steps are
visible when the escalator is not operating.
2. evvery day a cyclist meets a train at a particular
crossing.
the road is straignt before the crossing and both are
travelling
in the same direction. cyclist travels with a speed of 10
Kmph.
One day the cyclist comes late by 25 min. and meets the
train 5km
before the crossing. what is the seppd of the train.
3. five persons muckerjee, misra, iyer, patil and
sharma, all
take then first or middle names in the full names. There
are 4
persons having I or middle name of kumar, 3 persons with
mohan, 2
persons withdev and 1 anil.
--Either mukherjee and patil have a I or middle name of
dev or
misra and iyer have their I or middle name of dev
--of mukherkjee and misre, either both of them have a
first or
middle name of mohan or neither have a first or middle
name of
mohan
--either iyer of sharma has a I or middle name of kumar
hut not
both.
who has the I or middle name of anil
4. reading conprehension
5. a bird keeper has got Ppigeon, M mynas and S
sparrows. the
keeper goes for lunch leaving his assistant to watch the
birds.
a. suppose p=10, m=5, s=8 when the bird keeper comes
back, the
assistant informs the x birds have escaped. the bird
keeper
exclaims oh no! all my sparrows are gone. how many
birds flew
away.
b. when the bird keeper come back, the assistand told
him that
x birds have escaped. the keeper realised that atleast2
sparrows
have escaped. what is minimum no of birds that can escape.
6. select from the five alternatives A,B,C,D,E
AT THE end of each question ,two conditions will be
given.
the choices are to filled at follows.
a. if a definete conclusion can be drawn from condition 1
b. if a definete conclusion can be drawn from condition 2
c. if a definete conclusion can be drawn from condition 1
and 2
d. if a definete conclusion can be drawn from condition 1
or 2
e. no conclusion can be drawn using both conditions
1. person 1 says N<5
person says n>5
person 3 says 3N>20
person 4 says 3n>10
person 5 says N<8
whaT IS value of N
a) 1. no of persons who speak false being less than no of
persons
who tells the truth.
2. person 2 is telling the truth.
b) 1. no of persong telling the truth is greater than
no of
persons telling lies
2. person 5 is telling the truth.
7. there are N coins on a table. there are two
players A&B.
you can take 1 or 2 coins at a time. the person who
takes the
last coin is the loser. a always starts first
--1. if N=7
a) A can always win by taking two coins in his first
chanse
b) B can win only if A takes two coins in his first
chance.
c) B can always win by proper play
d) none of the above
--2. A can win by proper play if N is equal to
a) 13 b) 37 c) 22 d) 34 e) 48 ans. e.
--3. B can win by proper play if N is equal to
a) 25 b)26 c) 32 d) 41 e) none
--4. if N<4, can A win by proper play always

8. Two turns have vertain pecular charcteristics. One
of them
always lies on Monday, Wednesday, Friday. \the other
always lies
on Tuesdays, thursdays and saturdays. On the other days
they tel
the truth. You are given a conversation.
person A-- today is sunday my name is anil
person B-- today is tuesday, my name is bill

answers for selected questions
2. equal 1. 150
3. 8 2. 60 kmph
4. 37(M),41(S) 3. Mukherjee
5. 45 min. 8. today is tuesday
6. 0.8
7. 18
11. T max value = 4

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