Wednesday, 10 June 2015

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answer with full explanation of percentage questions

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answer with full explanation of percentage questions

1)_ Answer: Option B
Explanation:
Number of runs made by running = 110 - (3 x 4 + 8 x 6)
= 110 - (60)
= 50.
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Required percentage =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
50
x 100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif% = 45
5
%
110
11


2)_Answer: Option C
Explanation:
Let their marks be (x + 9) and x.
Then, x + 9 =
56
(x + 9 + x)
100
http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif 25(x + 9) = 14(2x + 9)
http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif 3x = 99
http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif x = 33
So, their marks are 42 and 33.


3)_Answer: Option D
Explanation:
Suppose originally he had x apples.
Then, (100 - 40)% of x = 420.
http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
60
x = 420
100

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif x =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
420 x 100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif  = 700.
60


4)_Answer: Option C
Explanation:
Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Number of such number =14
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Required percentage =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
14
x 100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif% = 20%.
70


5)_answer: Option E
Explanation:
x% of y =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
x
y
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
=
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
y
x
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
y% of x
100
100
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif A = B.


6)_Answer: Option A
Explanation:
20% of a = b   http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif   
20
a = b.
100

http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif b% of 20 =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
b
x 20
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
=
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
20
a x
1
x 20
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
=
4
a = 4% of a.
100
100
100
100


7)_Answer: Option E
Explanation:
Let the number of students be x. Then,
Number of students above 8 years of age = (100 - 20)% of x = 80% of x.
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif 80% of x = 48 +
2
of 48
3

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
80
x = 80
100
http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif x = 100.


8)_Answer: Option D
Explanation:
5% of A + 4% of B =
2
 (6% of A + 8% of B)
3

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
5
 A +
4
 B
=
2
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
6
 A +
8
 B
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
100
100
3
100
100

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
1
 A +
1
 B
=
1
 A +
4
 B
20
25
25
75

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
1
-
1
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif A = 
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
4
-
1
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif B
20
25
75
25

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
1
 A =
1
 B
100
75

A
=
100
=
4
.
B
75
3
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Required ratio = 4 : 3


9)_Answer: Option D
Explanation:
Let the number be x.
Then, error =
5
x -
3
x =
16
x.
3
5
15

Error% =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
16x
x
3
x 100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif% = 64%.
15
5x


10)_Answer: Option A
Explanation:
Number of valid votes = 80% of 7500 = 6000.
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Valid votes polled by other candidate = 45% of 6000
=
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
45
x 6000
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
= 2700.
100


11)_answer: Option A
Explanation:
Total number of votes polled = (1136 + 7636 + 11628) = 20400.
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Required percentage =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
11628
x 100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif% = 57%.
20400


12)_Answer: Option B
Explanation:
Let the sum paid to Y per week be Rs. z.
Then, z + 120% of z = 550.
http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif z +
120
z = 550
100

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif
11
z = 550
5

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif z =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
550 x 5
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif  = 250.
11



13)_Answer: Option C
Explanation:
Let the amount taxable purchases be Rs. x.
Then, 6% of x =
30
100

http://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif x =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
30
x
100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif = 5.
100
6
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Cost of tax free items = Rs. [25 - (5 + 0.30)] = Rs. 19.70



14)_Answer: Option A
Explanation:
Rebate = 6% of Rs. 6650 = Rs.
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
6
x 6650
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
= Rs. 399.
100

Sales tax = 10% of Rs. (6650 - 399) = Rs.
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
10
x 6251
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif
= Rs. 625.10
100
http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Final amount = Rs. (6251 + 625.10) = Rs. 6876.10




15)_answer: Option B
Explanation:
Increase in 10 years = (262500 - 175000) = 87500.
Increase% =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
87500
x 100
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif% = 50%.
175000

http://www.indiabix.com/_files/images/aptitude/1-sym-tfr.gif Required average =
http://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif
50
http://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gif% = 5%.
10


source:- india bix


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