RRB NTPC SAMPLE PAPER - ARITHMETIC - 172

1. The sum of first 20 odd natural numbers is equal to :

(a) 210
(b) 300
(c) 400
(d) 420

2. (8/125)^-4/3 simplifies to :

(a) 625/16
(b) 625/8
(c) 625/32
(d) 16/625

3. (6.5 × 6.5 – 45.5 + 3.5 × 3.5) is equal to :

(a) 10
(b) 9
(c) 7
(d) 6

4. What number should be subtracted from both terms of the ratio 15 : 19 in order to make it  3 : 4?

(a) 9
(b) 6
(c) 5
(d) 3

5. If p : q = r : s = t : u = 2 : 3, then (mp + nr + ot) : (mq + ns + ou) is equal to :

(a) 1 : 3
(b) 1 : 2
(c) 2 : 3
(d) 3 : 2

Railway Recruitment Board (RRB) NTPC Exams Study Kit

Answer:

1. (c) 2. (a) 3. (b) 4. (d) 5. (c)