# Mathematics Quiz For RRB NTPC : 5th December

Q1.The total age of A and B is 12 years more than the total age of B and C. C is how many years younger than A ?
(A) 12
(B) 13
(C) 14
(D) 15

Q2.The ratio of Ram’s present age to Mohan’s present age is 5 : 6. 8 years hence this ratio changes to 7 : 8 Find their present age of Ram.
(a) 18
(b) 19
(c) 20
(d) 21

Q3.If salary of X is 20% more than salary of y, then by how much percentage is salary of y less than X?
(a) 25
(b) 20
(c) 50/3
(d) 65/4

Q4.A can do a piece of work in 24 days. If B is 60% more efficient than A. then how many days does B require to do the same work?
(a) 12
(b) 15
(c) 16
(d) 18

Q5.The value of equipment depreciates by 20% each year. How much less will the value of the equipment be after 3 years?
(1) 48.8%
(2) 51.2%
(3) 54%
(4) 60%

Q6.In an examination, 93% of students passed and 259 failed. The total number of students appearing at the examination was
(1) 3700
(2) 3850
(3) 3950
(4) 4200

Q7.A boat goes 12 km upstream and comes back to the starting point in 3 hours. If the speed of the current is 3 km/ hr, then the speed (in km/ hr) of the boat in still water is
(1) 12
(2) 9
(3) 8
(4) 7

Q8.If the difference between the S.I. and C.I. on a certain amount at 10% per annum for 2 years is Rs. 20, then the sum is :
(a) Rs. 4000
(b) Rs 2000
(c) Rs. 1500
(d) Rs. 3000

Q9.Profit on selling the watch at Rs. 850 is equal to loss on selling it at Rs. 650. What is the cost-price of the watch?
(a) Rs. 720
(b) Rs. 750
(c) Rs. 800
(d) Rs. 735

Q10.The sum of first 20 odd natural numbers is equal to :
(1) 210
(2) 300
(3) 400
(4) 420

Solutions:

S1. Ans.(a)
Sol.
A + B = B + C + 12
A – C = 12
C is 12 years younger than A

S2. Ans.(c)
Sol.
Present → R : M → 5 : 6
8 year hence → R : M → 7 : 8
(7-5) or (8-6)
2r → 8 yrs
1r → 4 yrs
Present age of Ram = 5 × 4 = 20 yrs

S6. Ans.(a)
Sol.
Passed → 93%, Failed → 7%
7% → 259
100% → 3700
Total students ⇒ 3700

S7. Ans.(d)
Sol.
Upstream speed = B – 3
12 = 3 (B – 3)
12 = 3B – 9
21 = 3B
B= 7
Speed of Boat = 7

S9. Ans.(b)
Sol.
Profit = 850 – CP
Loss = CP – 650
850 – CP = CP – 650
1500 = 2CP
CP = 750 Rs

S10. Ans.(c)
Sol.
Sum of 1st 20
Odd numbers
= n²
= 20²
= 400

Important Links for RRB NTPC Recruitment 2019
RRB NTPC Previous year Cut Off | 1st & 2nd Stage Examination
RRB NTPC Recruitment 2019: Check FAQs
RRB NTPC Exam Pattern 2019 – Check Here
RRB NTPC Previous Year Exam Analysis
RRB NTPC Exam Syllabus

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