Aptitude Questions - MNC

[Kalyan]

Aptitude Questions - MNC

1)A can do a piece of work in 15 days and B can do a piece of work in 30 days respectively. If A and B are work together, How many days the job will be completed?
a) 15 days b) 20 days
c) 10 days d) 30 days
Answer:(c)
Explanation:
A can do a piece of work in x days=15 days
A's one day work=1/x=1/15
B can do a piece of work in y days=30 days
B'S day work=1/y=1/30
Both A and B complete the work together in x*y/x+y days
That is, 15*30/15+30=450/45=10 days.

2) A man passes through a high way of 81m long in 9 seconds,then how many kilo meter per hour a man walk?
a) 2/5km/hour b) 5/2km/hour
c) 3/5km/hour d) 5/3km/hour
Answer:(b)
Explanation:
In 9 seconds the man travelled 81m
In 1 second the man travelled 81/9=9
the man's speed in kilo meter/hour=9*(5/18)=5/2kmph.

3) Without HINDI and ENGLISH there is 5 subjects. In that subjects a person gets an average of 55.In HINDI and ENGLISH the marks are equal and when these are included his average marks are reduced to 61 calculate his mark in ENGLISH.
Answer:76
Explanation:
Average of 7 subjects=61 ; Total of 7 subjects = 427;
Without HINDI and ENGLISH the remaining 5 subjects average is =65;
Total of 5 subjects average is = 55 x 5 = 275;
Total marks in HINDI and ENGLISH = 427 – 275 = 152;
HINDI marks = 152/2=76.[HINDI and ENGLISH marks are equal,therefore ENGLISH marks is also 76].

4) Find the increased percentage of ARAVIND? if his salary is increased to RS.1500 from RS. 1000.
Answer:50%
Explanation:
Increased percentage =( Increased value x 100)/Original value
Increased value = Increased value – Original value = 1500 – 1000 = 500.
Therefore increased percentage = (500 x 100)/1000 = 50%.

5) The journey of the train takes 10hrs. If the first half of the journey is at 40kmph and second half of the journey is at 60kmph. Find out the length of the journey?
Answer:480kms
Explanation:
The whole journey takes two parts. Let the first half be x =40kmph and the second half be y = 60kmph.
The speed of the journey = 2xy/x + y We know that Distance = speed x time = (2xy/x + y) * 10 = (2*40*60/40+60)*10= 480kms.

6) For 6 months unexpired time ,find the B.D. For a bill of RS.1000 at 8% per annum?
Answer:RS.40
Explanation:
BD = (Bill amount x R x unexpired time)/100
= (1000 x 8 x (½))/100=(4000)/100 = RS.40.

7) A box contains 3 red pens and 4 blue pens. Two pens are drawn at random, find the probability?
Answer:9/21
Explanation:
Two pens drawn at random so that, Here, n(A) = 3c2 x 4c2; n(S) = 7c2;
p = 3c2 x 4c2 /7c2 = 9/21.

ANITHA brought apples for RS.100 and she sold for RS.122 fin it is profit or loss?
Answer:22
Explanation:
Apple cost price = 100; sold price = 122;
P = 122 – 100 = 22.ANITHA'S profit is RS.22.

9) If A and B together will take 6 days to finish the work. B alone takes 12 days to finish the same work . In how many days 'A' alone can finish it?
a) 6 days b) 12 days
c) 3 days d) 24 days
Answer:(b)
Explanation:
A and B can finish a work in 'x' days=6 days
B can finish it in 'y' days
A can finish the same work in x*y/x+y days
12*6/12-6=72/6=12 days.

10) If a man riding a horse in the bank of the river at 12kmph crosses it in 60mins,then find the bank of river?
a) 35m b)50m
c) 100m d)81m
Answer:(c)
Explanation:
For 1 hour the man travelled 12kms
For 60mins the man travelled 12000kms
For 3mins the man travelled =(12000/60)x3=100m.