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# Mathematics Quiz For RRB NTPC : 23rd December

Q1. The cost price of 36 books is equal to the selling price of 30 books. Profit in percentage is

Q2. On selling 12 copies of a book for Rs. 1800, the profit is equal to the cost price of 3 books. What is the cost price of each book?
(a) Rs. 120
(b) Rs. 150
(c) Rs. 1200
(d) Rs. 1500

Q3. In what ratio mixtures of 30% concentration of alcohol and 50% concentration of alcohol are to be added so that the resultant mixture will be of 45% concentration of alcohol?
(a) 1 : 2
(b) 1 : 3
(c) 2 : 1
(d) 3 : 1

Q4. The ratio of three numbers is 3 : 2 : 5 and the sum of their squares is 1862. Which one is the smallest number among them?
(a) 24
(b) 21
(c) 14
(d) 35

Q5. The average consumption of rice per person per month in a family of 8 adults and some kids is 10.8 kg, where the average consumption per person for adult is 15 kg and for kids is 6 kg. What is the number of kids in the family?
(a) 8
(b) 6
(c) 7
(d) 9

Q6. The average of 40 observations was 28. It was later found that in two observations, 42 was taken instead of 24 and 12 instead of 62. What is the correct average?
(a) 26.8
(b) 23.8
(c) 28.8
(d) 25.8

Q7. Each of the two equal sums of money is invested at 6% and 4% per annum simple interest. Second principal is invested for two more years as compared to first principal and thus amount received on each of the principal is Rs. 18600. What sum of total money put on lend?
(a) Rs. 12000
(b) Rs. 24000
(c) Rs. 15000
(d) Rs. 30000

Q8.In how much time will the simple interest be2/5 of principal at the rate of 8% per annum?
(a) 8 years
(b) 7 years
(c) 5 years
(d) 6 years

Q9. A dealer sells two bikes at Rs 14000 each. On one he gains 20% and on the other he loses 20%. Had he marked up their prices by 25% and give 10% discount, then what is his profit/loss percentage in the transaction?
(a) No loss & no loss
(b) 12.5% loss
(c) 10.24% loss
(d) 12.5% profit

Q10. The difference between a discount of 35% on Rs. 1700 and two successive discounts of 26% and 4% on the same amount is :-
(a) 92.48
(b) 98.68
(c) 102.68
(d) 104.68

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