Thursday, 12 January 2017

QUANTITATIVE APTITUDE FOR UPCOMING BANK AND OTHER COMPETITIVE EXAMINATION

Directions (1-5): What will come in place of question-mark (?) in the given number series?  
Q1. 158    78     38     18     8     ? 
(a) 3
(b) 5
(c) 2
(d) 7
(e) 6

Q2. 16    19     24     33     50     ? 
(a) 83
(b) 66
(c) 99
(d) 74
(e) 102

Q3. 402    400     388     358     302     ? 
(a) 212
(b) 236
(c) 190
(d) 182
(e) 210

Q4. 31    15     21     50     ?     767.25 
(a) 160.5
(b) 171.5
(c) 156.5
(d) 122.5
(e) 143.5

Q5. 5.5    8.5     23     89.5     ? 
(a) 455
(b) 420.5
(c) 445
(d) 415.5
(e) 433 




Directions (6-10): In the following questions, two equations numbered I and II are given. You have to solve both the equations and mark the appropriate answer. 
(a) If x ≥ y 
(b) If x ≤ y 
(c) If x < y 
(d) If x > y 
(e)If relationship between x and y cannot be established 

Q 06. 
I. x^2-3x-88=0 
II. y^2+8y-48=0

Q 07. 
I. 5x^2+29x+20=0 
II. 25y^2+25y+6=0

Q 08.
I. 2x^2-11x+12=0 
II. 2y^2-19y+44=0

Q09.
I. 3x^2+10x+8=0 
II. 3y^2+7y+4=0

Q10. 
I. 2x^2+21x+10=0 
II. 3y^2+13y+14=0


Solution
1






2




3


4

5



06. Ans.(e)
Sol. x^2-3x-88=0
x^2-11x+8x-88=0
x(x-11)+8(x-11)=0
(x+8)(x-11)=0
x = -8 or 11 
II. y^2+8y-48=0
y^2+12y-4y-48=0
y(y+12)-4(y+12)=0
(y-4)(y+12)=0
y = -12 or 4 
Hence, it cannot be established. 

07. Ans.(c)
Sol. I. 5x^2+29x+20=0
5x^2+25x+4x+20=0
5x(x+5)+4(x+5)=0
(5x+4)(x+5)=0
x=-5 or (-4)/5
II. 25y^2+25y+6=0
25y^2+15y+10y+6=0
5y(5y+3)+2(5y+3)=0
(5y+2)(5y+3)=0
y=(-3)/5 or (-2)/5
Hence, x < y 

08. Ans.(b)
Sol. I. 2x^2-11x+12=0
2x^2-8x-3x+12=0
2x(x-4)-3(x-4)=0
(2x-3)(x-4)=0
x=4 or 3/2
II. 2y^2-19y+44=0
2y^2-8y-11y+44=0
2y(y-4)-11(y-4)=0
(y-4)(2y-11)=0
y = 4 or 11/2
Hence, x ≤ y 

09. Ans.(b)
Sol. I. 3x^2+10x+8=0
3x^2+6x+4x+8=0
3x(x+2)+4(x+2)=0
(3x+4)(x+2)=0
x = -2 or (-4)/3
II. 3y^2+7y+4=0
3y^2+3y+4y+4=0
3y(y+1)+4(y+1)=0
(y+1)(3y+4)=0
y=-1 or (-4)/3
Hence, x ≤ y

10. Ans.(e)
Sol.  I. 2x^2+21x+10=0
2x^2+20x+x+10=0
2x(x+10)+1(x+10)=0
(2x+1)(x+10)=0
x=(-1)/2 or -10 
II. 3y^2+13y+14=0
3y^2+6y+7y+14=0
3y(y+2)+7(y+2)=0
(3y+7)(y+2)=0
y=-2 or y=(-7)/3
Hence, relationship between x and y cannot be established  





No comments:

Post a Comment

Printfriendly