Mock Test

Exam: RRB NTPC Subject: Quantitative Aptitude Topic: Percentage

Total Questions: 20

Q1. If 15% of a number is 30, and 25% of another number is 60, then what is 30% of the sum of these two numbers?

120 130 140 150
Q2. A man sells an article for Rs. 500 and makes a profit of 25%. He sells another article for Rs. 400 and makes a loss of 20%. What is the total profit or loss percentage?

1.82% profit 1.82% loss 3.64% profit 3.64% loss
Q3. A product is sold at a loss of 10%. If the selling price is increased by Rs. 50, the profit becomes 5%. What is the cost price?

Rs. 300 Rs. 325 Rs. 333.33 Rs. 350
Q4. A number is 30% less than another number. If the first number is 140, what is the second number?

180 190 200 210
Q5. If 40% of a number is 300, then what is 60% of that number?

400 450 500 600
Q6. What is 15% of ₹800?

₹100 ₹110 ₹120 ₹130
Q7. What is 3/5 as a percentage?

50% 55% 60% 65%
Q8. Two numbers are such that the second number is 30% of the first number. If the second number is 60, then what is the first number?

180 200 220 240
Q9. If x% of y is equal to y% of x, this is always true for:

All x and y x = y x and y are positive x and y are non-zero
Q10. If 20% of a number is 15, then what is 150% of that number?

100 112.5 125 150
Q11. The number of students in a school decreased by 15%. If the number of students decreased by 75, what was the original number of students?

500 450 550 600
Q12. What is 1.25 as a percentage?

12.5% 125% 1.25% 1250%
Q13. In a Poisson distribution, if the average number of events in an interval is λ, the probability of k events occurring is given by:

(λ^k * e^-λ) / k! (k^λ * e^-k) / λ! (λ^e * k^-λ) / e! (e^λ * k^-λ) / k!
Q14. A man buys 10 kg of apples for Rs. 80 per kg. 10% of the apples are found to be rotten. He sells the remaining apples at Rs. 90 per kg. His percentage profit is:

5% 7.5% 10% 12.5%
Q15. A shopkeeper increases the price of an article by 20% and then offers a discount of 10% on the marked price. If the final selling price is Rs. 270, what was the original cost price?

Rs. 250 Rs. 225 Rs. 300 Rs. 325
Q16. If the cost price of 15 articles is equal to the selling price of 12 articles, the profit percentage is:

20% 25% 30% 35%
Q17. The price of petrol increased by 10%. By what percentage must its consumption be reduced to keep the expenditure the same?

8.33% 9.09% 10% 11.11%
Q18. In a town, 60% of the population are males. If 40% of the males are married, what percentage of the population are married males?

20% 24% 30% 36%
Q19. In a class, 60% of students are girls. 40% of the girls are going on a picnic. 60% of the boys are going on a picnic. What percentage of the total students in the class are going on a picnic?

40% 48% 52% 60%
Q20. If dy/dx = k (where k is a constant), what is y?

kx + C k k + C x/k + C

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