arithmetical computation and analytical functions - One Line Questions

1. What is the probability of getting a head when a coin is tossed? — 1/2
2. Find the value of (0.05 * 0.05) / (0.05 + 0.05). — 0.025
3. If x + y = 5 and x - y = 1, then what is the value of x? — 3
4. Find the value of (sqrt(16) + sqrt(25)) / sqrt(9). — 2
5. What is the remainder when 7^3 is divided by 5? — 2
6. A train travels at a speed of 60 km/hr. How long will it take to cover a distance of 150 km? — 2 hours 30 minutes
7. The speed of a boat in still water is 10 km/hr. If it travels upstream at 8 km/hr, what is the speed of the stream? — 2 km/hr
8. A number is increased by 10% and then decreased by 10%. What is the net percentage change? — 1% decrease
9. Two numbers are in the ratio 2:3. If their product is 216, find the numbers. — 12 and 18
10. A cistern is filled by a pipe in 5 hours. It is emptied by another pipe in 4 hours. If both pipes are opened, how long will it take to empty the cistern? — 20 hours
11. A shopkeeper buys an article for Rs. 800 and sells it for Rs. 1000. What is his profit percentage? — 25%
12. If the cost price of 12 articles is equal to the selling price of 10 articles, what is the profit percentage? — 20%
13. The sum of the first 10 even numbers is: — 110
14. What is the smallest 4-digit number that is divisible by 3, 4, and 5? — 1020
15. Find the smallest number which when divided by 6, 9, 12, and 15 leaves a remainder of 4 in each case. — 184
16. A sum of money doubles itself in 8 years at simple interest. In how many years will it treble itself? — 16 years
17. The ratio of two numbers is 3:5 and their LCM is 75. Find the numbers. — 15 and 25
18. If the perimeter of a square is 64 cm, what is its area? — 256 sq cm
19. If A's salary is 20% more than B's salary, by what percentage is B's salary less than A's salary? — 16.67%
20. What is the smallest number that must be added to 1900 so that the sum is divisible by 12? — 6
21. If 5 men can do a piece of work in 10 days, how many men are needed to do the same work in 5 days? — 10 men
22. If x:y = 2:3 and y:z = 4:5, then x:z is: — 8:15
23. If the diagonal of a square is 10 cm, what is its area? — 50 sq cm
24. What is the value of (125)^(1/3)? — 5
25. A clock gains 5 seconds every hour. How much time will it gain in 3 days? — 3.6 minutes
26. If 3/5 of a number is 90, then 1/3 of that number is: — 30
27. If 15% of 80 is added to 30% of 120, the result is: — 60
28. The sum of the digits of a two-digit number is 9. If the digits are reversed, the new number is 27 greater than the original number. Find the number. — 36
29. Find the least common multiple (LCM) of 8, 12, and 18. — 72
30. Find the value of x if 2x + 5 = 15. — 5
31. A person walks from point A to point B at 4 km/hr and from B to A at 6 km/hr. What is the average speed for the entire journey? — 4.8 km/hr
32. If 60% of a number is 120, what is 25% of that number? — 50
33. What is the area of a circle with a radius of 7 cm? (Use pi = 22/7) — 154 sq cm
34. A number is multiplied by 3/4. If the result is 60, find the number. — 80
35. If 5 men and 3 women can do a work in 8 days, and 2 men and 5 women can do the same work in 10 days, then 3 men and 3 women can do the work in how many days? — 6 days
36. What is the average of the first five prime numbers? — 9.2
37. If 20% of a number is 30, what is 50% of that number? — 75
38. Two numbers are in the ratio 5:7. If the sum of the numbers is 144, find the numbers. — 60 and 84
39. If 15% of a salary is deducted for taxes and 5% for savings, what percentage of the salary is left? — 80%
40. A shopkeeper marks his goods 20% above the cost price and then offers a 10% discount. What is his net profit percentage? — 8%
41. If a number is increased by 20% and then decreased by 10%, what is the net percentage change? — 8% increase
42. The sum of two numbers is 120 and their difference is 40. What are the numbers? — 80 and 40
43. A rectangular field is 50 meters long and 30 meters wide. What is its area? — 1500 sq meters
44. If the area of a square is 81 sq cm, what is its perimeter? — 36 cm
45. A man can row a boat downstream at 12 km/hr and upstream at 8 km/hr. What is the speed of the man in still water? — 10 km/hr
46. A sum of Rs. 5000 is lent at 10% per annum compound interest. What is the interest after 2 years? — Rs. 1050
47. A sum of Rs. 10000 is invested for 2 years at 5% per annum compound interest. What is the amount after 2 years? — Rs. 11025
48. A man buys 10 kg of rice at Rs. 20/kg and 15 kg of rice at Rs. 25/kg. What is the average price per kg? — Rs. 23.50
49. If the price of 10 pens is Rs. 150, then the price of 18 pens is: — Rs. 270
50. A man buys 20 pens for Rs. 10 each and sells 15 pens for Rs. 12 each. What is the profit/loss? — Rs. 30 profit
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