QUANTITATIVE APTITUDE - 15

                                       Quantitative Aptitude Quiz For AAO | Bank Exams | RRB

1. Ravi borrowed some money at the rate of 4% per annum for the first 3 yr, at the rate of 8% per annum for the next 2 yr and at the rate of 9% per annum for the period beyond 5 yr. If he pays a total simple interest of Rs.19550 at the end of 7 yr, how much money did he borrow?

a) 39500

b) 42500

c) 41900

d) 43000

e) None of these
Explanations: Let Ravi borrowed Rs.X
Then, (X*4*3)/100 + (X*8*2)/100 + (X*9*2)/100 = 19550
By solving this, X = 42500 (b)

2. What is the area of circle whose radius is equal to the side of square whose perimeter is 112 m?

a) 176 sq m

b) 2504 sq m

c) 284 sq m

d) 1956 sq m

e) None of these
Explanations: Side of square = 112/4 = 28 m, Radius = 28 m
Hence, area of circle = 22/7 * 28 * 28 = 2464 (e)

3. A sum of Rs.731 is divided amongst A, B and C such that A receives 25% more than B and B receives 25% less than C. What is C's share in the amount?

a) 172

b) 200

c) 262

d) 258

e) None of these
Explanations:
        A              B      C
(75*125)/100 : 75 : 100 (left) = 93.75 : 75 : 100
Share of C = 100/(100+75+93.75) * 731 = 272 (e)

4. In how many different ways can the letters of the word PRAISE be arranged?

a) 720

b) 610

c) 360

d) 210

e) None of these
Explanations: 6! = 720 (a)

5. If the numerator of a fraction is increased by 150% and the denominator of the fraction is increased by 300%, the resultant fraction is 5/18. What is the original fraction?

a) 4/9

b) 4/5

c) 8/9

d) 8/11

e) None of these
Ans: 4/9 (a)

6. A car covers the first 39 km of it's journey in 45 min and covers the remaining 25 km in 35 min. What is the average speed of the car?

a) 40 km/h

b) 64 km/h

c) 49 km/h

d) 48 km/h

e) None of these
Explanations: Average Speed = Total distance/ Total time taken
Then, (39+25) / (45/60)+(35/60) = 64/80 * 60 = 48 km/h (d)

7. 4 examiners can examine a certain number of answer papers in 10 days working 5 hr a day. For how many hours in a day would 2 examiners have to work in order to examine twice the number of answer papers in 20 days?

a) 8

b) 9

c) 10

d) 17/2

e) None of these
Ans: 10 (c)

Directions (Q.8 - 11): What should come in place of the question mark (?) in the following series?

8. 9,  62,  ?,  1854,  7415,  22244

a) 433

b) 309

c) 406

d) 371

e) None of these
Explanations: Series is: *7-1, *6-1, *5-1, *4-1...Ans: (d)

9. 4,  8,  24,  60,  ?,  224

a) 178

b) 96

c) 109

d) 141

e) None of these
Explanations: Series is: +2^2, +4^2, +6^2, +8^2 ... Ans: (e) 124

10. 8000,  1600,  320,  64,  12.8,  ?

a) 2.56

b) 3.5

c) 3.2

d) 2.98

e) None of these
Explanations: Series is: each number/5. Ans: (a)

11. 6,  9,  15,  27,  51,  ?

a) 84

b) 99

c) 123

d) 75

e) None of these
Explanations: Series is: +3, +6, +12, +24, +48. Ans: (b)