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Wrong number series
Directions (1 – 4): Find the wrong number in the given series and give the correct number as your answer.
1) 12, 15, 22, 41, 79, 157
A) 20
B) 21
C) 23
D) 24
E) Series is right
2) 1200, 720, 360, 144, 40.2, 8.64
A) 43.2
B) 42.4
C) 41.8
D) 44.6
E) None will replace the wrong number
3) 18.6, 101, 142.2, 162.8, 172.4, 178.25
A) 168.5
B) 170.4
C) 173.1
D) 178.6
E) 174.3
4) 36, 124, 201, 267, 320, 366
A) 280
B) 308
C) 314
D) 322
E) 348
Approximation
Direction (05-08): What is the approximate value should come in place of question mark in the following questions?
5) 39.912 % of 79.908 + √3970.12 * 4.897 – 12.190 * 7.198=?
A) 263
B) 267
C) 271
D) 277
E) 281
6) 1899.981 ÷ √1444.12 – 119.910 % of 34.975 + 4.932 * 104.292=?
A) 521
B) 528
C) 537
D) 533
E) 546
7) 83.339 % of 102.198 + 45.4545 % of 186.978 + ? =49.912 * 3.189
A) -10
B) -15
C) -20
D) -5
E) -25
8) 174.879 + ? * 43.134 = 194.972 % of 199.894
A) 2
B) 5
C) 8
D) 11
E) 0
Directions (09-10): In the following questions, two equations I and II are given. You have to solve both equations and give answer as,
a) If x>y
b) If x≥y
c) If x<y
d) If x≤y
e) If x=y or the relation cannot be established.
9)
I) x2+ 46x + 493=0
II) 2y2+ 64y + 510=0
10)
I) 2x2– 42x + 216=0
II) y2– 26y + 168=0
Answers :
Directions (1-4) :
1) Answer: C
12 * 2 – 9=15
15 * 2 – 7=23
23 * 2 – 5=41
41 * 2 – 3=79
79 * 2 – 1=157
The wrong number is 22
2) Answer: A
1200 * 0.6=720
720 * 0.5=360
360 * 0.4=144
144 * 0.3=43.2
43.2 * 0.2=8.64
The wrong number is 40.2
3) Answer: C
18.6 + 82.4=101
101 + 41.2=142.2
142.2 + 20.6=162.8
162.8 + 10.3=173.1
173.1 + 5.15=178.25
The wrong number is 172.4
4) Answer: D
36 + 88=124
124 + 77=201
201 + 66=267
267 + 55=322
322 + 44=366
The wrong number is 320
Directions (5-8) :
5) Answer: A
39.912 % of 79.908 + √3970.12 * 4.897 – 12.190 * 7.198=?
40% of 80 + √3969 * 5 – 12 * 7 = ?
32 + 315 – 84=?
263=?
6) Answer: B
1899.981 ÷ √1444.12 – 119.910 % of 34.975 + 4.932 * 104.292=?
1900 ÷ √1444 – 120% of 35 + 5 * 104 = ?
50 – 42 + 520=?
528=?
7) Answer: C
83.339 % of 102.198 + 45.4545 % of 186.978 + ? =49.912 * 3.189
5/6 * 102 + 5/11 * 187 + ? = 50 * 3
85 + 85 + ? =150
?=- 20
8) Answer: B
174.879 + ? * 43.134 = 194.972 % of 199.894
175 + ? * 43 = 195% of 200
175 + ? * 43=390
?=5
Directions (9-10) :
9) Answer: D
x2Â + 46x + 493=0
x2Â + 29x + 17x + 493=0
x(x + 29) + 17(x + 29)=0
(x + 17)(x + 29)=0
x=-17, -29
2y2Â + 64y + 510=0
2y2Â + 30y + 34y + 510=0
2y(y + 15) + 34(y + 15)=0
(2y + 34)(y + 15)=0
y =-17, -15
Hence, x≤y
10) Answer: D
2x2 – 42x + 216=0
2x2 – 24x – 18x + 216=0
2x(x – 12) – 18(x – 12)=0
(2x – 18) (x – 12)=0
x =9, 12
y2 – 26y + 168=0
y2 – 12y – 14y + 168=0
y(y – 12) – 14( y – 12)=0
(y – 14)(y – 12)=0
y =14, 12
Hence, x≤y
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