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TNPSC FRIENDS FACEBOOK EDUCATIONAL GROUP-MATHS MATERIAL
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01 2013 2 25
,
,
-
: 1
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TNPSC FRIENDS FACEBOOK EDUCATIONAL GROUP-MATHS MATERIAL
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: 2
: 3
2
. 3
.300
?
A. 5000 B.4000
C.10000 D.1000
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Soln :
n = 2
LOGIC :
Pn/100(r+3-r) = 300
3Pn/100 = 300
P = (300 * 100 ) / ( 3 * 2 )
P = 5000
= 5000 .
: 4
A B 10 , B C
15 , C A 18
B
?
A. 30 B. 20
C. 12 D. 18
Soln :
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A , B
A + B = 1/10 .Eqn.1
B , C
B + C = 1/15 .Eqn.2
C , A
C + A = 1/18 .Eqn.3
Eqn.1 + Eqn.2 => A + B +C + A = 1/10 + 1/18
2A + B + C = 14/90 = 7/45
2A + B + C = 7/45 .Eqn.4
Substitute Eqn.2 in Eqn.4 => 2A + 1/15 = 7/45
2A = 7/45 1/15
2A = 4/45
=> A = 2/45
Sustitute A value in Eqn.1 => 2/45 + B = 1/10
B = 1/10 2 /45
B B = 1/18
Hence ,
B = 18
[ : , ]
: 5
LABOUR KBAPTS , CANDID
?
L-1=K A+1=B B-1=A O+1=P U-1=T R+1=S Likewise LABOUR = BBMEHE
ANS : BBMEHE
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: 6
25
?
A. 50 % B. 25 %
C. 56.25 % D. 46.25 %
Soln :
= 100
= r^2 = * 100 * 100
= 10000 .
25% = 125 .
= * 125 * 125
= 15625 . .
= 15625 - 10000 . .
= 5625 . .
= 5625/10000 * 100
= 56.25 %
: 7
28 , 5:2
. 2
? A. 2:1 B. 1:2 C. 2:3 D. 1:3
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Soln :
28 .
5:2 .
5+2=7
28/7=4
4 * 5 : 4 * 2 = 20 : 8
20 , 8 .
2 ,
20 10 .
= 20 : 10
= 2 : 1
: 8
A,B,C 4 . A
12 , B 18 , C
?
A. 10
B. 12
C. 9
D. 18 Soln:
A , B , C : A + B + C = 1/4
A B
C .
A + B + C A B = 1/4 1/12 1/18 = 4/36 = 1/9
C = 9
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: 9
Explanation :
ANS: 8
: 10
X- 5 Y- 15
, 10 Y- 20 Z-
. Z- .3000 , X , Y
Z ?
A. .18000
B. .12000
C. .27000
D. .16000
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Soln :
Z= 3000 [Given]
X- 5 Y- 15
. X * 5/100 = Y * 15/100 -------Eqn.1
10 Y- 20 Z- . Y * 10/100 = Z * 20/100 --------Eqn.2 Substitute Z value in Eqn.2 => Y * 10/100 = 3000 * 20/100
=> y = 6000 Substitute Y Value in Eqn.1 => X * 5/100 = 6000 * 15/100
=> X = 18000
:
X + Y + Z = 18000 + 6000 + 3000 = 27000
: 11
2004 2005
.
A. 20 % B . 50 % C. 66.66 % D. 71.66 % Soln:
2004 = 30
2005 = 50
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TNPSC FRIENDS FACEBOOK EDUCATIONAL GROUP-MATHS MATERIAL
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= 50 - 30
= 20
= 20,00,000 * 100 30,00,000 = 66.66 %
: 12
20 5 1
.
? A. 16.66 % B. 15 % C. 20 % D. 16 % Soln :
5 = 5000
5 20 % = 5000 * 20/100
= 1000 ..
= 1 .
5 1
= 5 + 1 = 6
.
6 1
= 1/6 * 100 = 100/6 = 16.66 %
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TNPSC FRIENDS FACEBOOK EDUCATIONAL GROUP-MATHS MATERIAL
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: 13
12 10
? A. 18 % B. 16.66 % C. 20% D. 25 % Soln:
12 = .100
10 = .100
1 = 100 / 10 = .10
12 = 12 * 10 = .120
= 120 - 100 = 20 .
= 20/100 * 100 = 20 %
: 14
P Q - 2:3 ,
8 ,
P- ? A. 16 B. 24 C. 12 D. 30 Soln :
P Q - = 2x:3x
P Q- = 8
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3x-2x=8
x= 8
P- = 2 * 8 = 16 [.A]
Q- = 3 * 8 = 24
: 15
A B- 3 , B C- 4 .680-
,
A. 160, 40, 480
B. 480, 160, 40
C. 480, 40, 160
D. 160, 480, 40 Soln : A = 3B & B = 4C [Given]
A- = x .
A = 3B , B- =A/3=x/3
B = 4C , C- = B / 4 = x / ( 3 * 4 ) = x / 12
A- + B- + C- = 680
x + x/3 + x/12 = 680 (12x + 4x + x) /12 = 680
17x = 680 * 12 x = 480
A- = x = 480
B- = x/3 = 480/3 = 160
C- = x/12= 480/12= 40
Ans : 480 , 160 , 40
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:16
, 12
, 9 6 . 1.5
? A. 1072 B. 648 C. 324 D. 192
Soln:
= x x
= 12 x 9 x 6
= 648 ^3
= ()^3
= (1.5)^3
=3.375 ^3
= /
= 648/3.375
= 192
:17
.
ANS : D
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:18
A- B- 25 , B- A- ? A. 50 % B. 45 % C. 22.33 % D. 33.33 % Soln :
A- = 100
B- = 75
B- A- =(25/75)x100 = 33.33 %
:19
A,B,C,D E - C- .100 . A- C- . B- . E- C- . D- , ? 1. B 2. C 3. D 4. E Soln:
C - = 100
,
B < A < C
C < E < D
,
= D
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:20
.
ANS : C
:21
.
.75000
? A. 7,500 B. 8,000 C. 8,500 D. 9,000
Soln :
= 75000 x 12/100
= 9000
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:22
A , B , C
. A 252
, B 308 .
?
A. 20 18
b. 40 20
c. 46 12
d. 30 Soln :
252- , 308- ... .
252- , 308- ... = 2772
1 60
= 2772/60 = 46 , 12 ,
,
46 12
:23
, 2112 2792
? A. 63 B. 64 C. 68 D. 78
Soln :
4 .
4- .
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2112-4=2108
2792-4=2788
... .
2108 2788 ... = 68 .
: 68
:24
.800 3 .920 .
3
3 ? A. 1,092 B. 992 C. 1,882 D. 1,182
Soln: Formula:
, i = (Pnr)/100
r = (i x 100)/(Pn)
, i = 920 800 = 120
, r = (120 x 100)/(800 x 3 ) = 5 %
3 , 5 + 3 = 8 %
, i = 800 x 3 x 8 / 100 = 192
3 = 800 + 192
= 992
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:25
. 414 15
?
A. .400
B. .314
C. .326
D. .360
Soln:
= X
,
+ =
X + X * 15/100 = 414
X + 3X/20 = 414
(20X+3X)/20 = 414
=> X = 360
= 360
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