RRB-NTPC 2016 Mathematics
Practice subject-wise previous year questions
Question 126
Arithmetic
A student initially scored equal marks in Mathematics and Physics. Later, the marks in Mathematics increase by 20% of the original Mathematics marks, while the marks in Physics decrease by 10% of the original Physics marks. Taking the initial total marks as the base, what is the overall percentage change in the total marks?
A
10% increaseB
5% decreaseC
5% increaseD
No changeQuestion 127
Arithmetic
The largest four-digit number which when divided by 15, 12 and 14 leaves remainder 5 in each case is:
A
9595B
9192C
9665D
9988Question 128
Arithmetic
Three friends Arshdeep, Sandeep and Avtar are on a trip by a car. Arshdeep drives during the first 3 hours at an average speed of 52 km/hr. Sandeep drives during the next 4 hours at an average speed of 65 km/hr. Avtar drives for the next 3 hours at an average speed of 76 km/hr. They reached their destination after exactly 10 hours. Their average speed during the journey was:
A
64.4 km/hrB
60.2 km/hrC
56.4 km/hrD
65.2 km/hrQuestion 129
Arithmetic
The present ages of two sisters are in the ratio \(5:7\) . After 4 years, their ages will be in the ratio \(6:8\) . Find the present age of the younger sister.
A
22 yearsB
20 yearsC
18 yearsD
24 yearsQuestion 130
Arithmetic
A cricketer has scored an average of 55 runs in 9 matches. In the 10th match, he scores 85 runs. What is his new average?
A
57B
58C
56D
55Question 131
Arithmetic
A bookseller bought 7 identical sets of books at ₹375 each. He sold 3 sets at a profit of 16% per set and the remaining sets at a profit of 24% per set. What was his total profit (in ₹) from selling all the sets?
A
₹504B
₹588C
₹540D
₹572Question 132
Arithmetic
A group of 3 adults and 4 children pay ₹380 for movie tickets. Another group of 2 adults and 3 children pay ₹270 for the same tickets. What is the price of one adult ticket?
A
₹80B
₹50C
₹60D
₹70Question 133
Arithmetic
A Company produces 1,520 packets of noodles in 5 hours. How many packets will it produce in 17 hours at the same rate?
A
5,861B
5,816C
5,168D
5,618Question 134
Arithmetic
The sum of all interior angles of a regular polygon is 1800°. How many diagonals does the polygon have?
A
51B
50C
53D
54Question 135
Arithmetic
A, B, and C start a business by investing ₹60,000, ₹80,000, and ₹1,20,000, respectively. After one year, the total profit earned is ₹78,000. By how much does C’s share exceed B’s share?
A
₹9,800B
₹12,000C
₹9,400D
₹10,600Question 136
Arithmetic
The diagonals of a rhombus are mutually perpendicular and bisect each other. One diagonal is 10 cm longer than the other. If the area of the rhombus is 600 cm 2 , the perimeter (in cm) of the rhombus is:
A
96 cmB
84 cmC
100 cmD
120 cmQuestion 137
Arithmetic
A shopkeeper offers two successive discounts of 18% and 15% on a frock whose marked price is ₹1,000. What is the final selling price (in ₹) of the frock?
A
679B
796C
769D
697Question 138
Arithmetic
A shopkeeper offers the following schemes on toys of the same marked price. (A) Successive discounts of 43% and 19% on any number of toys bought. (B) Successive discounts of 41%, 21% and 49% on any number of toys bought. (C) 35% discount on the first 5 toys and 3% discount on each toy thereon. (D) 4 toys free of cost on buying 5 toys. A customer wants to buy 5 toys. Which of the above schemes is the least beneficial to her?
A
DB
AC
BD
CQuestion 139
Arithmetic
A tank can be filled by pipe P in 8 hours and by pipe Q in 4 hours. If they open alternately for one hour each with Q starting first, what is the total time taken to fill the tank?
A
5 hoursB
4 hours and 40 minutesC
6 hoursD
5 hours and 20 minutesQuestion 140
Arithmetic
The average of 5 consecutive integers is 10. What is the smallest integer?
A
8B
9C
6D
7Question 141
Arithmetic
A man is walking at 4 km/hr. A 180 m long train crosses him in 12 seconds while coming from the opposite direction. What is the speed of the train (in km/hr)?
A
32B
50C
61D
45Question 142
Arithmetic
Ram has ₹1000 in the denomination of ₹10, ₹20 and ₹5 notes. If the number of ₹10 notes is 16 more than that of ₹20 notes and the number of ₹5 notes is twice the number of ₹20 notes, find the total number of notes that Ram has.
A
90B
120C
80D
100Question 143
Arithmetic
At present, a father is 30 years older than his son. In 12 years, the father will be three times as old as his son. What is the present age of the son?
A
4 yearsB
5 yearsC
6 yearsD
3 yearsQuestion 144
Arithmetic
In a science experiment, chemicals X, Y, and Z are mixed in the ratio 5:2:3. If the total weight of the mixture is 100 grams, how much of chemical Y is present?
A
10 gramsB
50 gramsC
20 gramsD
30 gramsQuestion 145
Arithmetic
Two solid hemispheres are joined together to make a sphere. The total surface area of solids reduced by approximately ____%.
A
25B
50C
66.67D
33.33Question 146
Arithmetic
Two trains, A and B, start simultaneously from stations Delhi and Mumbai respectively towards each other on parallel tracks. After meeting, train A takes 16 hours to reach Mumbai, and train B takes 9 hours to reach Delhi. If train A's speed is 60 km/h, what is the length of train B (in meters), given that it crosses a pole in 18 seconds?
A
280B
420C
300D
400Question 147
Arithmetic
The expenditures of R are 65% of his salary. If his salary increased by 10% and his savings are ₹3,150 more than previous savings, his expenditures are now 60% of his salary. His present salary is ₹______.
A
37,500B
35,000C
39,000D
38,500Question 148
Arithmetic
Lekhraj sells an article at a profit of 25%. If the cost price is increased by 20% and the selling price is reduced by 10%, what percentage loss will Lekhraj incur?
A
6.25%B
6.5%C
7.25%D
7.5%Question 149
Arithmetic
Three numbers are in the ratio 17 : 13 : 8, and their LCM is 7072. Their HCF is:
A
23B
3C
12D
4Question 150
Arithmetic
The 5-digit number 7a35b is divisible by 45, where a and b are positive integers. What is the value of (a + b)?
A
7B
14C
5D
12