RBI Assistant Prelims 2016-17 (Important Questions-11)

RBI Assistant Prelims 2016-17 (Important Questions-11)

1. Normally it takes 6 hrs for tap A to fill a tank but accidently tap B was opened due to which tank was filled 2 hrs earlier. If the tank is emptied completely and tap B is opened then how long will it take to fill the tank ?

A. 10 hrs
B. 12 hrs
C. 13 hrs
D. 11 hrs
E. None of these

Sol. Lets assume it takes 'x' hrs for tap B to fill the tank.
Then, 1/6 + 1/x = 1/4
Solving, x = 12 hrs.

2. The length of the rectangle is 20cm and the breadth is 8cm more than twice the length of the rectangle. The area of the square is 15 times the area of rectangle. Find the perimeter of square ?

A. 400
B. 450
C. 480
D. 460
E. None of these

Sol. Breadth = 2*20 + 8 = 48cm
Area of rectangle = 20*48
As given, area of square = 15*20*48 = 14400
Thus, side of the square = 120cm
Perimeter of square = 4*120 = 480cm.

3. Suresh purchased a phone at Rs 5000 and sold it at a gain of 20%. From this amount he purchased another phone and sold it at 10% loss. Find its overaall loss/gain ?

A. 500
B. 400
C. 300
D. 600
E. None of these

Sol. Second S.P. = 5000*(120/100)*(90/100) = Rs 5400
Total Gain = 5400 - 5000 = Rs 400.

4. The present age ratio of Rajesh and Mahesh is 3:8. Mahesh's present age is 12 yrs less than Rohan's present age. Rohan's age will be 50 yrs after 6 yrs. Find Rajesh's present age ?

A. 15
B. 12
C. 30
D. 28
E. None of these

Sol. R/M = 3/8     (where Rajesh's age is R and Mahesh's age is M)
Also, M = Ro -12 (where Rohan's age is Ro)
Also, Rohan's age is = Ro = 50 - 6 = 44 yrs.
Thus, solving, we get, R = 12 yrs.

5. In an election there were only two candidates . One of the candidates secured 40% of votes and is defeated by other candidate by 300 votes. The total number of votes polled is ?

A. 1200
B. 1500
C. 1250
D. 1350
E. None of these

Sol. Lets assume the total number of votes is 'x'.
Thus, x(60-40)/100 = 300
Solving, x = 1500 votes.

Directions(6-10): What should come in place of (_) in the following series:

6. 13,14,30,93, _

A. 382
B. 376
C. 366
D. 327
E. 380

Sol. B.376
13 * 1 + 1 = 14
14 * 2 + 2 = 30
30 * 3 + 3 = 93

7. 9,11,16,33,98,_

A. 326
B. 336
C. 331
D. 340
E. 355  

Sol. E.355
11 – 9 = 2
16 – 11 = 5
33 – 16 = 17;( 5 – 2 = 3; 17 – 5 = 12(3*4))

8. 8,14,25,46,82,_

A. 138
B. 153
C. 166
D. 139
E. 135

Sol. A.138
14 – 8 = 6
25 – 14 = 11
46 – 25 = 21; 11 – 6 = 5, 21 – 11 = 10

9. 65, 70, 63, 74, 61, _

A. 76
B. 78
C. 71
D. 76
E. 73 

Sol. B.78
65 – 63 = 2
74 – 70 = 4
63 – 61 = 2

10. 14, 8, 7, 11.5, 22, _

A. 54
B. 59
C. 56
D. 58
E. 51

Sol. C.56
14 * 0.5 + 1 = 8
8 * 1 – 1 = 7

7 * 1.5 + 1 = 11.5 

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