1. What is the square root of 144?

2. If the selling price of an item is $80 and the profit percentage is 25%, what is the cost price of the item?

3. A rectangle has a length of 12 cm and a width of 8 cm. What is its perimeter?

4. If 3 workers can complete a task in 8 days, how many days would it take for 6 workers to complete the same task?

5. A train travels a distance of 300 km at a speed of 60 km/h. How long does it take to cover the distance?

6. If the area of a square is 64 square units, what is the length of one side?

7. If 2x + 5 = 17, what is the value of x?

8. A bag contains 5 red balls, 3 green balls, and 2 blue balls. If one ball is drawn at random, what is the probability of getting a red ball?

9. The perimeter of a rectangle is 36 cm, and its length is 10 cm. What is its width?

10. What is the next number in the sequence: 3, 6, 12, 24, __ ?

11. A car travels a distance of 360 km with an average speed of 90 km/h. How much time does it take to complete the journey?

12. A shopkeeper offers a discount of 20% on an item originally priced at $50. What is the sale price?

13. If 6 workers can complete a task in 8 hours, how many workers are needed to complete the task in 4 hours?

14. The ratio of two numbers is 3:4, and their sum is 70. What is the larger number?

15. If the price of a book is reduced by 20%, how much percent should its sale be increased to bring the revenue back to the original level?

16. The sum of the ages of a father and his son is 60 years. Five years ago, the father's age was four times the age of the son. What are their present ages?

17. What is the next number in the sequence: 2, 5, 10, 17, __ ?

18. A car travels a distance of 150 km with an average speed of 50 km/h. How much time does it take to complete the journey?

19. A train travels a distance of 540 km at an average speed of 90 km/h. How long does it take to complete the journey?

20. If the ratio of boys to girls in a class is 3:2 and there are 30 students in total, how many girls are there?