RRB-NTPC 2016 Mathematics
Practice subject-wise previous year questions
Question 376
Arithmetic
Find the greatest number that divides 75, 105 and 150 exactly.
A
10B
25C
5D
15Question 377
Arithmetic
A team of 3 workers, P, Q, and R, is assigned to paint a large wall. P alone can finish the work in 14 days, Q alone in 21 days, and R alone in 42 days. If they start together but P leaves after 4 days, and the remaining work is completed by Q and R together, in how many total days is the wall completely painted?
A
10 daysB
9 daysC
11 daysD
12 daysQuestion 378
Arithmetic
A shopkeeper fixes the marked price of an item 150% above its cost price. What percentage of discount on marked price should be allowed to gain 110%?
A
17%B
16%C
14%D
15%Question 379
Arithmetic
Which of the following pairs of numbers is co-prime? A) (15, 25) B) (14, 35) C) (9, 28) D) (21, 49)
A
BB
CC
DD
AQuestion 380
Arithmetic
Three positive integers a, b, and c satisfy the following conditions: (i) a and b are coprime, (ii) b and c are coprime, (iii) a and c are not coprime, (iv) abc = 360. The minimum possible value of a + b + c is:
A
95B
27C
23D
33Question 381
Arithmetic
The average of 6.5, 10.8, 20 and a is 13. The value of a is:
A
15.7B
16.7C
14.7D
13.7Question 382
Arithmetic
If 45% of a number exceeds 20% of it by 30, then the number is:
A
140B
100C
120D
160Question 383
Arithmetic
A product with marked price ₹3,000 is sold with successive discounts of 15% and 25%. What is the final selling price after these two discounts?
A
₹1,936.50B
₹1,872C
₹1,912.50D
₹1,896Question 384
Arithmetic
Two articles are sold at the same selling price. On one article, the trader makes a 25% profit, and on the other, he incurs a 25% loss. What is the overall percentage loss?
A
7.25%B
6.25%C
5.25%D
8.25%Question 385
Arithmetic
A merchant marks his products 30% above the cost price and provides a 10% discount on the marked price. What percent profit does he earn?
A
17%B
15%C
16%D
18%Question 386
Arithmetic
The sum of two numbers is 54. If three times the smaller number exceeds twice the larger number by 6, find the difference between the two numbers.
A
8.4B
7.6C
6.6D
7.2Question 387
Arithmetic
The price of an article is first increased by 30% and then decreased by 20%. Due to these successive changes, the final price becomes ₹40 more than the original price. What is the original price of the article?
A
₹1,000B
₹1,200C
₹1,100D
₹900Question 388
Arithmetic
Find the third proportional to 240 and 120.
A
40B
50C
60D
80Question 389
Arithmetic
In a school, Class A has 24 students with an average height of 160 cm, and Class B has 20 students with an average height of 168 cm. The average height of students in Class C is 165 cm. If the overall average height of all students from Classes A, B and C is 164 cm, find the number of students in Class C.
A
20B
26C
18D
16Question 390
Arithmetic
Two trains of lengths 160 meters and 140 meters are moving in opposite directions at 55 km/h and 65 km/h, respectively. Find the time taken by them to cross each other completely.
A
6 secondsB
9 secondsC
8 secondsD
10 secondsQuestion 391
Arithmetic
A company hires a certain number of temporary workers for a project. If each worker is paid ₹500 per day, the total daily wage bill exceeds the company’s budget by ₹4,000. If instead each worker is paid ₹450 per day, the total daily wage bill falls short of the budget by ₹2,000. Find the number of workers hired.
A
120B
160C
200D
280Question 392
Arithmetic
Workers P and Q can complete a task in 16 days if working together. P alone takes 24 days. If P and Q start the task together, but Q leaves after 4 days, how many more days will P alone take to finish the work?
A
10 daysB
6 daysC
9 daysD
18 daysQuestion 393
Arithmetic
If the average of three numbers is 7, what is their total sum?
A
7B
21C
10D
14Question 394
Arithmetic
Raghav drives from City A to City B in three equal segments of 40 km each. He drives the first segment at 40 km/hr, the second at 60 km/hr, and the third at 120 km/hr. What is his average speed for the whole trip?
A
50 km/hrB
64 km/hrC
60 km/hrD
68 km/hrQuestion 395
Arithmetic
The price of fuel decreases by 45%, 25% and 15% in three successive months, but increases by 45% in the fourth month. What is the percentage decrease in the price of fuel in the fourth month as compared to its original price? (Round off to 2 decimal places.)
A
53.54%B
47.82%C
49.16%D
46.44%Question 396
Arithmetic
A shopkeeper fixes the marked price of an item 120% above its cost price. What percentage of discount on marked price should be allowed to gain 43%?
A
35%B
38%C
33%D
32%Question 397
Arithmetic
A number leaves a remainder of 2 when divided by 5 and a remainder of 3 when divided by 7. What is the smallest positive integer that satisfies both conditions?
A
38B
23C
24D
17Question 398
Arithmetic
A wholesaler offers a trade discount of 30% on the marked price of an electric kettle to retailers. A retailer then announces a scheme discount of 12% on the price after receiving the trade discount. If the retailer sells the kettle to a customer for ₹2,464, what is the marked price of the kettle?
A
₹4,000B
₹4,400C
₹4,200D
₹3,800Question 399
Arithmetic
What is the largest 6-digit number that is completely divisible by 96?
A
999888B
999984C
999912D
999936Question 400
Arithmetic
Two positive numbers differ by 20. The mean proportional between these two numbers is 24. What is the sum of these two numbers?
A
53B
51C
52D
50