Page:Elementary algebra (1896).djvu/82

64 Rh 7. A man makes a journey of x miles. He travels a miles by coach, b by train, and finishes the journey by boat. How far does the boat carry him ? 8. A horse eats a bushels and a donkey b bushels of corn in a week ; how many bushels will they together consume in n weeks ? 9. If a man was x years old 5 years ago, how old will he be y years hence ? 10. A boy is x years old, and five years hence his age will be half that of his father. How old is the father now ? 11. What is the age of a man who y years ago was m times as old as a child then aged x years ? 12. A's age is double B's, B's is three times C's, and C is x years old : find A's age. 13. What is the interest on $1000 in b years at c per cent. ? 14. What is the interest on $x in a years at 5 per cent. ? 15. What is the interest on $50 a in a years at a per cent. ? 16. What is the interest on $24xy in x months at y per cent, per annum ? 17. A room is x yards in length, and y feet in breadth ; how many square feet are there in the area of the floor ? 18. A square room measures x feet each way ; how many square yards of carpet will be required to cover it ? 19. A room is p feet long and x yards in width ; how many yards of carpet two feet wide will be required for the floor ? 20. What is cost in dollars of carpeting a room a yards long, b feet broad, with carpet costing c dimes a square yard ? 21. A room is a yards long and b yards broad ; in the middle there is a carpet c feet square ; how many square yards of oil-cloth will be required to cover the rest of the floor ? 22. How long will it take a person to walk b miles if he walks 20 miles in c hours ? 23. A train is running with a velocity of x feet per second ; how many miles will it travel in y hours ? 24. How many men will be required to do in x hours what y men do in xz hours ?