RRB-NTPC 2016 Mathematics

Practice subject-wise previous year questions

Question 551
Arithmetic

What is the mode of the following data: 12, 15, 18, 18, 20, 18, 22, 22, 25, 28, 22, 15, 18, 12?

A
22
B
18
C
15
D
12
Question 552
Arithmetic

Two successive price increases of 15% and 15% on an article are equivalent to a single percentage increase of:

A
31%
B
30%
C
32.25%
D
31.5%
Question 553
Arithmetic

An investment triples in 6 years under compound interest. After how many years will it become 27 times?

A
24 years
B
15 years
C
21 years
D
18 years
Question 554
Arithmetic

If the ratio of two numbers is 3 : 8, and their HCF is 6, then their LCM is:

A
155
B
189
C
148
D
144
Question 555
Arithmetic

A two-digit number is such that four times the sum of its digits is equal to the number formed by reversing its digits. If the difference between the digits is 3, find the original number.

A
63
B
96
C
69
D
36
Question 556
Arithmetic

A trader buys 20 kg of rice for ₹1,000 and sells it at ₹55 per kg. What is the profit percentage?

A
12%
B
10%
C
8%
D
15%
Question 557
Arithmetic

If 2, x, and 18 are in continued proportion, find the positive value of x.

A
12
B
4
C
6
D
9
Question 558
Arithmetic

A prize of ₹8,400 is to be shared between A and B in the ratio 3:5. Find B's share.

A
₹5,000
B
₹5,200
C
₹5,250
D
₹5,150
Question 559
Arithmetic

The present age of a father is thrice that of his son. After 15 years, the age of the father will be twice that of his son. What is the present age ( in years) of the father?

A
48
B
45
C
52
D
42
Question 560
Arithmetic

The largest four-digit number which when divided by 14, 15 and 8 leaves remainder 4 in each case is:

A
9686
B
9199
C
9196
D
9244
Question 561
Arithmetic

A school drum beats every 12 minutes, and the school bell rings every 18 minutes. If both sounded together at 9:00 AM, how many times will they sound together again before 11:00 AM?

A
3
B
4
C
5
D
6
Question 562
Arithmetic

Girish scored 448 marks in an examination and was 81 marks short of 46% of maximum marks. In the same examination, his friend scored 805 marks. What is the percentage of marks scored by his friend?

A
71%
B
70%
C
67%
D
72%
Question 563
Arithmetic

The average of 6.5, 10.8, 20 and a is 15. The value of a is:

A
21.7
B
24.7
C
22.7
D
23.7
Question 564
Arithmetic

A cyclist travels from point A to B and back from B to A along the same route. On the onward journey, he covers one-third of the distance at 12 km/hr and the remaining distance at 18 km/hr. On the return journey, he covers half of the distance at 9 km/hr and the remaining distance at 18 km/hr. Find the average speed (in km/hr) for the entire round trip.

A
9 km/hr
B
13.5 km/hr
C
15 km/hr
D
11.5 km/hr
Question 565
Arithmetic

Two trains of lengths 120 m and 180 m are moving in the same direction at speeds of 60 km/h and 40 km/h, respectively. Find the time taken by the trains to cross each other.

A
54 seconds
B
76.9 seconds
C
59.3 seconds
D
67.9 seconds
Question 566
Arithmetic

The sum of the digits of a two-digit number is 11. If the digits are reversed, the new number is 27 more than the original number. What is the original number?

A
56
B
47
C
38
D
65
Question 567
Arithmetic

If one angle of an isosceles triangle is 110°, what are the measures of the other angles of the triangle?

A
25° and 25°
B
35° and 35°
C
25° and 35°
D
25° and 45°
Question 568
Arithmetic

A shopkeeper offers the following schemes on toys of the same marked price.  (A) Successive discounts of 5% and 21% on any number of toys bought.  (B) Successive discounts of 38%, 33% and 21% on any number of toys bought.  (C) 8% discount on the first 6 toys and 27% discount on each toy thereon.  (D) 3 toys free of cost on buying 7 toys.  A customer wants to buy 7 toys. Which of the above schemes is the least beneficial to her?

A
A
B
C
C
B
D
D
Question 569
Arithmetic

A spherical tank has a radius of 2 meters. If the tank is filled with water to 80% of its total volume, what is the volume of water in the tank (rounded to the nearest cubic meter)?

A
33
B
21
C
38
D
27
Question 570
Arithmetic

A and B can do a piece of work in 12 days and 12 days, respectively. Both work for 3 days and then A leaves. How long (in days) will B take to complete the remaining work?

A
6
B
5
C
8
D
7
Question 571
Arithmetic

₹2,288 is divided among Pankaj, Meera, and Ashok in such a way that if ₹39, ₹47, and ₹40 are deducted from their respective shares, they have money in the ratio 17:15:14. Find Meera's share after deduction.

A
₹855
B
₹805
C
₹705
D
₹605
Question 572
Arithmetic

What is the compound interest on ₹3,000 for 2 years at 20% per annum, interest compounded annually?

A
₹1,200
B
₹1,300
C
₹1,440
D
₹1,320
Question 573
Arithmetic

The following data shows the number of minutes taken by 15 students to complete a mathematics test: 42, 38, 55, 47, 50, 44, 60, 39, 48, 52, 45, 41, 49, 46, 53. Find the median time taken by the students.

A
47 minutes
B
46 minutes
C
48 minutes
D
47.5 minutes
Question 574
Arithmetic

A sum of money becomes ₹7,865 after 2 years and ₹8,651.50 after 3 years on compound interest at the same rate, compounded annually. Find the sum.

A
₹6,500
B
₹7,000
C
₹7,200
D
₹6,800
Question 575
Arithmetic

A wholesaler offers two options for a sofa set marked at ₹80,000: either a flat discount of 30% or two successive discounts of 20% and 12%. What is the difference in the selling price between the two options?

A
₹320
B
₹240
C
₹400
D
₹480