Thursday, August 11, 2011

Aptitude test answer

Aptitude Test 4

AptitudeResult & Statistics
1.A fires 5 shots to B's 3 but A kills only once in 3 shots while B kills once in 2 shots. When B has missed 27 times, A has killed:
A.
30 birds
B.
60 birds
C.
72 birds
D.
90 birds

Answer: Option A

Explanation:

Let the total number of shots be x. Then,

Shots fired by A =5x
8

Shots fired by B =3x
8

Killing shots by A =1of5x=5x
3824

Shots missed by B =1of3x=3x
2816

3x= 27 or x =27 x 16= 144.
163

Birds killed by A =5x=5x 144= 30.
2424

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2.Six years ago, the ratio of the ages of Kunal and Sagar was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sagar's age at present?
A.
16 years
B.
18 years
C.
20 years
D.
Cannot be determined
E.
None of these

Answer: Option A

Explanation:

Let the ages of Kunal and Sagar 6 years ago be 6x and 5x years respectively.

Then,(6x + 6) + 4=11
(5x + 6) + 410

10(6x + 10) = 11(5x + 10)

5x = 10

x = 2.

Sagar's present age = (5x + 6) = 16 years.

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3.Q is as much younger than R as he is older than T. If the sum of the ages of R and T is 50 years, what is definitely the difference between R and Q's age?
A.
1 year
B.
2 years
C.
25 years
D.
Data inadequate
E.
None of these

Answer: Option D

Explanation:

R - Q = R- T Q = T.

Also, R + T = 50 R + Q = 50.

So, (R - Q) cannot be determined.

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4.
1 +1+1= ?
1 + x(b - a) + x(c - a)1 + x(a - b) + x(c - b)1 + x(b - c) + x(a - c)
A.
0
B.
1
C.
xa - b - c
D.
None of these

Answer: Option B

Explanation:

Given Exp. =
1 + 1 + 1
1 +xb+xc
xaxa
1 +xa+xc
xbxb
1 +xb+xa
xcxc

=xa+xb+xc
(xa + xb + xc)(xa + xb + xc)(xa + xb + xc)

=(xa + xb + xc)
(xa + xb + xc)

= 1.

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5.
1+1= ?
1 + a(n - m)1 + a(m - n)
A.
0
B.
1
2
C.
1
D.
am + n

Answer: Option C

Explanation:

1+1=
1 + 1
1 +an
am
1 +am
an
1 + a(n - m)1 + a(m - n)

=am+an
(am + an)(am + an)

=(am + an)
(am + an)

= 1.

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6.Simran started a software business by investing Rs. 50,000. After six months, Nanda joined her with a capital of Rs. 80,000. After 3 years, they earned a profit of Rs. 24,500. What was Simran's share in the profit?
A.
Rs. 9,423
B.
Rs. 10,250
C.
Rs. 12,500
D.
Rs. 10,500

Answer: Option D

Explanation:

Simran : Nanda = (50000 x 36) : (80000 x 30) = 3 : 4.

Simran's share = Rs.24500 x3= Rs. 10,500.
7

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7.A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
A.
12 days
B.
15 days
C.
16 days
D.
18 days

Answer: Option B

Explanation:

A's 2 day's work =1x 2=1.
2010

(A + B + C)'s 1 day's work =1+1+1=6=1.
2030606010

Work done in 3 days =1+1=1.
10105

Now,1work is done in 3 days.
5

Whole work will be done in (3 x 5) = 15 days.

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8.Robert is travelling on his cycle and has calculated to reach point A at 2 P.M. if he travels at 10 kmph, he will reach there at 12 noon if he travels at 15 kmph. At what speed must he travel to reach A at 1 P.M.?
A.
8 kmph
B.
11 kmph
C.
12 kmph
D.
14 kmph

Answer: Option C

Explanation:

Let the distance travelled by x km.

Then,x-x= 2
1015

3x - 2x = 60

x = 60 km.

Time taken to travel 60 km at 10 km/hr =60hrs= 6 hrs.
10

So, Robert started 6 hours before 2 P.M. i.e., at 8 A.M.

Required speed =60kmph.= 12 kmph.
5

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9.A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:
A.
1 km/hr
B.
1.5 km/hr
C.
2 km/hr
D.
2.5 km/hr

Answer: Option A

Explanation:

Suppose he move 4 km downstream in x hours. Then,

Speed downstream =4km/hr.
x

Speed upstream =3km/hr.
x

48+48= 14 or x =1.
(4/x)(3/x)2

So, Speed downstream = 8 km/hr, Speed upstream = 6 km/hr.

Rate of the stream =1(8 - 6) km/hr = 1 km/hr.
2

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10.In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs. 16.50 kg?
A.
3 : 7
B.
5 : 7
C.
7 : 3
D.
7 : 5

Answer: Option C

Explanation:

By the rule of alligation:

Cost of 1 kg pulses of 1st kindCost of 1 kg pulses of 2nd kind
Rs. 15Mean Price
Rs. 16.50
Rs. 20
3.501.50

Required rate = 3.50 : 1.50 = 7 : 3.

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11.
If loga+logb= log (a + b), then:
ba
A.
a + b = 1
B.
a - b = 1
C.
a = b
D.
a2 - b2 = 1

Answer: Option A

Explanation:

loga+ logb= log (a + b)
ba

log (a + b) = logaxb= log 1.
ba

So, a + b = 1.

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12.In a race of 200 m, A can beat B by 31 m and C by 18 m. In a race of 350 m, C will beat B by:
A.
22.75 m
B.
25 m
C.
19.5 m
D.
74m
7

Answer: Option B

Explanation:

A : B = 200 : 169.

A : C = 200 : 182.

C=CxA=182x200= 182 : 169.
BAB200169

When C covers 182 m, B covers 169 m.

When C covers 350 m, B covers169x 350m= 325 m.
182

Therefore, C beats B by (350 - 325) m = 25 m.

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13.If 6th March, 2005 is Monday, what was the day of the week on 6th March, 2004?
A.
Sunday
B.
Saturday
C.
Tuesday
D.
Wednesday

Answer: Option A

Explanation:

The year 2004 is a leap year. So, it has 2 odd days.

But, Feb 2004 not included because we are calculating from March 2004 to March 2005. So it has 1 odd day only.

The day on 6th March, 2005 will be 1 day beyond the day on 6th March, 2004.

Given that, 6th March, 2005 is Monday.

6th March, 2004 is Sunday (1 day before to 6th March, 2005).

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14.An accurate clock shows 8 o'clock in the morning. Through how may degrees will the hour hand rotate when the clock shows 2 o'clock in the afternoon?
A.
144º
B.
150º
C.
168º
D.
180º

Answer: Option D

Explanation:

Angle traced by the hour hand in 6 hours =360x 6º= 180º.
12

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15.A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:
A.
145º
B.
150º
C.
155º
D.
160º

Answer: Option C

Explanation:

Angle traced by hour hand in 12 hrs = 360º.

Angle traced by hour hand in 5 hrs 10 min. i.e.,31hrs =360x31º= 155º.
6126

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16.The market value of a 10.5% stock, in which an income of Rs. 756 is derived by investing Rs. 9000, brokerage being %, is:
A.
Rs. 108.25
B.
Rs. 112.20
C.
Rs. 124.75
D.
Rs. 125.25

Answer: Option C

Explanation:

For an income of Rs. 756, investment = Rs. 9000.

For an income of Rs.21, investment = Rs.9000x21= Rs. 125.
27562

For a Rs. 100 stock, investment = Rs. 125.

Market value of Rs. 100 stock = Rs.125 -1= Rs. 124.75
4

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17.From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings?
A.
1
15
B.
25
57
C.
35
256
D.
1
221

Answer: Option D

Explanation:

Let S be the sample space.

Then, n(S) = 52C2 =(52 x 51)= 1326.
(2 x 1)

Let E = event of getting 2 kings out of 4.

n(E) = 4C2 =(4 x 3)= 6.
(2 x 1)

P(E) =n(E)=6=1.
n(S)1326221

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18.One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is a face card (Jack, Queen and King only)?
A.
1
13
B.
3
13
C.
1
4
D.
9
52

Answer: Option B

Explanation:

Clearly, there are 52 cards, out of which there are 12 face cards.

P (getting a face card) =12=3.
5213

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19.The true discount on Rs. 2562 due 4 months hence is Rs. 122. The rate percent is:
A.
12%
B.
131%
3
C.
15%
D.
14%

Answer: Option C

Explanation:

P.W. = Rs. (2562 - 122) = Rs. 2440.

S.I. on Rs. 2440 for 4 months is Rs. 122.

Rate =100 x 122%= 15%.
2440 x1
3

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Direction (for Q.No. 20):

Find out the wrong number in the given sequence of numbers.

20.22, 33, 66, 99, 121, 279, 594
A.
33
B.
121
C.
279
D.
594

Answer: Option C

Explanation:

Each of the number except 279 is a multiple of 11.

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Marks : 0/20
Total number of questions:20
Number of answered questions:0
Number of unanswered questions:20


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