Math Questions for SSC CHSL and RRB NTPC EXAM

Q1. The average weight of 8 men is increased by 1.5kg when one of the men whose weight 65kg is replaced by a new man. The weight of the new man is:    
(a) 70 kg
(b) 74 kg
(c) 76 kg
(d) 77 kg

Q2. The average marks in Mathematics for five students was found to be 50. Later on, it was discovered that in case of one student, the marks 48 were misread as 84. The correct average is:  
(a) 40.2
(b) 40.8
(c) 42.8
(d) 48.2

Q3. The average of first three numbers is double of the fourth number. If the average of all the four numbers is 12, find the 4th number. 
(a) 16
(b) 48/7
(c) 20
(d) 18/7

Q4. Sunil covers a distance by walking 6 hours. While returning his speed decreases by 1 km/hr and he takes 9 hours to cover the same distance. What was his speed in return journey? 
(a) 2 km/hr
(b) 3 km/hr
(c) 5 km/hr
(d) Cannot be determined

Q5. A man covers half of his journey at 6 km/h, and the remaining half at 3 km/h. Find his average speed. 
(a) 3 km/h
(b) 4 km/h
(c) 4.5 km/h
(d) 9 km/h

Q6. Without any stoppage a train travels a certain distance at an average speed of 80 kmph, and with stoppages, he covers the same distance at an average speed of 60 kmph. How many minutes per hour does train stop?  
(a) 10 min
(b) 15 min
(c) 20 min
(d) 25 min

Q7. A 110 m long train is running at a speed of 60 km/h. How many seconds does it take to cross an another train of length 170m which is standing on parallel track?   
(a) 15.6 s
(b) 16.8 s
(c) 17.2 s
(d) 18 s

Q8. P can complete a work in 24 days and Q can do the same work in 18 days. IF P after doing 4 days, leaves the work, find in how many days Q will do the remaining work?  
(a) 10 days
(b) 12 days
(c) 15 days
(d) 16 days

Q9. Ram can do a work in 10 days. With the help of Shyam he can do the same work in 6 days. If they get Rs. 100 for the work, what is the share of that of Shyam?    
(a) 40 Rs.
(b) 25 Rs.
(c) 24 Rs.
(d) 60 Rs.
Q10. There are 10 filling pipes each capable of filling a cistern alone in 6 minutes and 6 emptying pipes each capable of emptying a cistern alone in 8 minutes. All pipes are opened together and as a result, tank fills 44 litres of water per minute. Find the capacity of the tank.  
(a) 36 litres
(b) 52 litres
(c) 40 litres
(d) 48 litres

Q11. A pipe can fill a tank in x hours and another pipe can empty it in y(y > x) hours. If both the pipes are open, in how many hours will the tank be filled? 
(a) (x - y) hours
(b) (y - x) hours
(c) xy/((x-y) ) hours
(d) xy/((y-x) ) hours

Q12. At a certain rate of simple interest Rs. 600 amounted to Rs. 720 in 2 years. If the rate of interest be decreased by 3%, what will be the amount after 2 year?  
(a) Rs. 684
(b) Rs. 680
(c) Rs. 704
(d) Rs. 696

Q13. A sum becomes 6 fold at 5% per annum. At what rate, the sum becomes 12 fold in the same time? 
(a) 10%
(b) 12%
(c) 9%
(d) 11%

Q14. At what rate percent compounded yearly will Rs. 800 amount to Rs. 882 in 2 years?  
(a) 10%
(b) 6%
(c) 8%
(d) 5%

Q15. The difference between compound interest and simple interest at the same rate on Rs. 5000 for 2 years is Rs. 72. The rate of interest per annum is  
(a) 6%
(b) 8%
(c) 10%
(d) 12%

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