3. A tank 4 ft. by 4 ft., and 5 ft. deep. 4. A tank 5 ft. by 6 ft., and 6 ft. deep.

5. How many gallons will a cistern contain that is 5 ft. square and 8 ft. deep?

6. How many barrels of water will a circular cistern 6 ft. in diameter and 8 ft. deep hold?

SUGGESTION.

The area of the bottom may be found by Art. 260.

That multiplied by the depth will be the volume.

7. How many barrels would be required to fill a circular cistern 8 ft. in diameter and 16 ft. deep?

270. Approximate measurements.

1. A bushel is nearly 14 cu.ft. Hence of the number of cubic feet is very nearly the number of bushels.

2. A cubic foot of any liquid contains nearly 71⁄2 gallons; a barrel of 31 gallons about 4 cu. ft.

3. A ton of fine hay in a well-settled large stack, or mow, is about 450 cu. ft. A ton of clover hay is about 550 cu. ft.

A ton of Lehigh stove coal is about 34 cu. ft.

A ton of Schuylkill white ash stove coal is about 35 cu. ft.

A ton of red ash stove coal is about 36 cu. ft.

1. About how many bushels of grain will a box 4 ft. long, 3 ft. wide, and 5 ft. high hold?

2. A watering trough is 8 ft. long, 14 in. wide, and 12 in. deep. About how many gallons will it hold?

3. A tank 6 ft. square and 8 ft. deep will hold about how many barrels ?

4. About how many tons of fine hay can be packed in a mow 20 ft. by 18 ft., and 8 ft. high?

5. How many tons, approximately, of clover hay are there in a stack 20 ft. long, 15 ft. wide, and 12 ft. high?

6. How many tons of Lehigh stove coal can be put in a bin 12 ft. long, 8 ft. wide, and 6 ft. deep? How many tons of Schuylkill white ash stove coal? How many tons of red ash stove coal?

GENERAL REVIEW EXERCISES.

ORAL EXERCISES.

271. 1. If 3 pears cost 5 cents, what will 5 pears cost at the same rate? What will 8 pears cost?

2. If 5 peaches cost 63 cents, what will 9 peaches cost at the same rate? What will 20 cost?

3. How much will 7 oranges cost at the rate of 6 oranges for 65 cents?

4. If 8 books are worth $114, what are 10 books worth at the same rate? What are 20 worth at the same rate?

5. If 9 ducks cost $63, what will 14 cost?

6. If 4 pigs cost $131, how much will 12 pigs cost at the same rate? How much will 16 cost?

7. How many sheep can be bought for $56 when 4 sheep cost $14?

8. A man gave $72 for potatoes, at the rate of $8 for 9 bushels. How many bushels did he buy?

9. How much must be paid for 22 yards of ribbon at the rate of 5 yards for 7

dimes?

10. What must be paid for 8 shovels when 5 shovels are sold for $34?

11. If of a barrel of flour costs $5, what will 7 barrels cost? What will 10 barrels cost?

12. Mr. A gave of his month's salary for a coat and for board, and had $33 left. What was his salary?

13. One third of the trees in an orchard bear apples, peaches, and all the other trees, which are 30, bear plums. How many trees are there in the orchard?

14. If of a ship is worth $15000, how much is § of it worth?

15. Harry spent 80 cents for a book, which was 12 of his money; with the remainder he bought oranges at 2 cents apiece. How many oranges did he buy?

16. A farmer bought a quantity of goods and paid $30 cash, which was of the value of the goods. How many cords of wood, at $3 per cord, will it take to pay for the remainder?

17. If 7 men can do a piece of work in 10 days, how long will it take 9 men to do the same work ?

18. It required 6 days for 20 men to load a vessel. How many men would be required to load it in 2 days?

19. If it costs $40 to support a family of 8 persons for 24 weeks, what will it cost to support 11 persons 4 weeks?

20. Mr. B paid of his money for a horse, of the remainder for a suit of clothes, of the remainder for provisions, and had $60 left. How much money had he at first?

21. Three men engage to husk a field of corn. The first can do it in 10 days, the second in 12, and the third in 15 days. In what time can they do it together?

22. One half of Charles's money equals of Henry's, and Charles has $12 more than Henry. How much has each?

23. If a pole 12 ft. long casts a shadow 17 ft. long, what is the length of a pole which casts a shadow 85 ft. long at the same time?

24. A man bought a horse and carriage for $400, and the horse cost as much as the carriage. What was the cost of each?

How

25. At a certain election the successful candidate had a majority of 100, which was of all the votes cast. many votes did the defeated candidate receive?

26. A, B, and C together have $2700. How much has each, if A has 3 times as much as B, and C as much as A and B together?

27. How many square feet are there in the surface of a cube whose dimensions are 3 inches?

28. Three men can do a piece of work in 5 days. The first can do it in 15 days, and the second can do it in 20 days. How long will it take the third to do it?

29. Three men bought a thrashing machine for $560. The first paid for of it, the second for of it, and the third paid for the rest.

What should the third receive as his share of the profits, if they gained $300?

30. A lad spent on July 4th 1⁄2 of his money and 6 cents more for fire-crackers, and of it and 4 cents more for torpedoes. If that was all the money he had, how much had he?

SUGGESTION. of his money and 6 cents, plus of it and 4 cents, is of it and 10 cents, which was equal to the whole of his money.

31. While A earns $3, B earns $4, and C earns $5. At the end of a certain time the earnings of all were $60. How much had each earned?

32. John bought a certain number of oranges at the rate of 4 for 5 cents, and sold them at the rate of 3 for 4 cents. He gained 25 cents. How many did he buy?

33. A fox is 90 rods before a hound, and runs 12 rods while the hound runs 13. How far will the fox run before he is overtaken?

34. One third of a certain number is 12 more than 1 of it. What is the number?

35. If to a certain number you add † of itself and of itself, the sum will be 87. What is the number?

36. An octavo book contains 480 pages.

How many

reams of paper will it require to print an edition of 1600 copies, making no allowance for waste?

37. Two men divided a lot of wood which they had purchased together for $45. One took 7 cords, and the other took 8 cords. What ought each to pay?

38. A and B hired a pasture for $30. A put in 4 horses for 5 weeks, and B 5 horses for 6 weeks. How much ought each to pay?

39. If to a certain number you add 17 more than gof itself, the sum will be 82. What is the number?

40. R and W can do a piece of work in 15 days. If R does as much as W, in how many days can each do it alone?

41. A, B, and C own 720 acres of land. How much has each if A owns 3 times as much as C, and B 4 times as much as C?

42. S, T, and V have $580. has as much as V, and T has

How much has each if S as much as V?

43. If 3 men or 5 boys can do a piece of work in 20 days, how long will it take 4 men and 10 boys to do it?

44. A certain piece of work can be done by 5 men or by 8 boys in 12 days. In how many days can 5 men and 8 boys do it?

45. A farmer put his grain into four bins. Into the first he put of it, into the second, into the third, and into the fourth 56 bushels. How many bushels of grain had he? 46. A man paid $36 for a cow, and

of the price paid

for the cow was of the cost of a horse. horse cost?

What did the

47. A man in trade lost of the money he invested, after which he gained $700; he then had $3400. What was his total loss?