QUANTITATIVE APTITUDE FOR UPCOMING BANK AND OTHER COMPETITIVE EXAMINATION
I. x^2-3x-88=0
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.
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
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
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