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46. By the U.S. census of 1890, the ages of seven very old persons, were 128, 125, 123, 122, 118, 115, and 113 years respectively. What was their average age?

47. Mary is 6 years 2 months old, Charles is 11 years 3 months, Ruth 11 years 1 month, and Horace 13 years 2 months. What is the sum of their ages in months? What is their average age in months? In years and months?

48. On five successive mornings the barometer stood as follows: 29.65 inches, 29.73 inches, 29.8 inches, 30.02 inches, and 30.254 inches. What was the average height?

49. A grocer had 2 pounds of tea worth 35 cents a pound, 4 pounds worth 40 cents a pound, 1 pound worth 74 cents, and 10 pounds worth 75 cents a pound, what was the value of the entire lot? If he should mix the teas, for how much per pound could he afford to sell the mixture?

50. A grocer mixed together 3 pounds of coffee worth 34 cents a pound, 4 pounds worth 29 cents a pound, 6 pounds worth 18 cents a pound, and 2 pounds worth 32 cents a pound. What was the value of 1 pound of the mixture?

51. In the Lincoln school there were three classes as follows first class, 27 pupils, average age 14 years; second class, 65 pupils, average age 10 years; third class, 106 pupils, average age 7 years. Find the average age of the pupils in the whole school. (Answer to tenths.)

52. A man had a stock of goods worth $10,000; these he expected to sell at a gain of $15 on every $100 worth. How much did he expect to receive for them?

53. The above goods became damaged by fire, and were sold at a loss of $40 on every $100. How much did the dealer receive for them?

54. A man sells books for a publisher at $4.50 each. For selling he is to receive $1.50 on every book sold. If he receives $24, how many books are sold? How much is due the publisher ?

55. If a steamer can cross from New York to Southampton in 6 days 13 hours, a distance of 3,119 miles, what is her average speed per hour?

56. If the front wheel of a bicycle is 7.065 feet around the outer edge, and it turns 8,960 times in an hour's run, how many feet does it go? How many miles, and how many feet over?

57. How many square miles (640 acres) are there in the forests of Russia, which are estimated at 460,000,000 acres ?

58. New South Wales has produced the largest piece of gold ever found. Its weight being 640 pounds and value $148,000, what was its value per pound?

The area and population of the New England states by the census of 1890 were as follows:

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59. What is the area of all the New England states? 60. How much smaller is all New England than the state of Missouri, which has 69,415 square miles?

61. How many less square miles are there in Maine than in all the other New England states?

62. How many inhabitants were there in New England in 1890 ?

63. How many more inhabitants were there in Massachusetts than in Maine, Vermont, and New Hampshire? 64. In 1890 Boston had 448,477 inhabitants. How many inhabitants had Massachusetts exclusive of Boston?

65. How many more inhabitants were there in Boston than in the state of New Hampshire?

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72. It is estimated that there are 1,479,486,192 people in the world, and 52,361,115 square miles of land. What is the average number of inhabitants to a square mile?

The area of the surface of the system of great lakes of North America is as follows:

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73. What is the sum of the areas of these lakes?

74. How much larger is Lake Ontario than Rhode Island and Connecticut together?

75. How much smaller is Massachusetts than Lake Erie? 76. Which is larger, all the great lakes together or New England, and how much?

77. The number of inhabitants in the United States in 1880 was 50,155,783; in 1890 it was 62,622,250. What was the average increase per year?

78. The area of the United States being 3,668,167 square miles, what was the number of inhabitants to a square mile in 1880 ?* In 1890 ?*

79. October 1, a gas meter registered 122,300 feet consumed. January 1, it registered 128,300 feet. What was the cost of the gas for the quarter at $2.25 per thousand feet?

80. Telegraphic rates to Canton being $2.09 per word of ten letters or less, with double rate for each word exceeding ten letters, what is the charge for the following telegram? "Bronson, Canton: River and harbor appropriation bill passed senate Wednesday by bare majority."

* Answer to hundredths.

ACCOUNTS AND BILLS.

151. Below is a record by a painter and glazier of articles sold and services rendered by him to Mr. Edward Crane.

Mr. Edward Crane

NEW YORK, Dec. 1, 1894.

To H. H. HUNT, Painter and Glazier, Dr.

1894.

Nov. 8 To Shellae 25, 1 hour's work 45¢

28" Oil 9¢, Spirits 5¢, 4 lbs.

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81

200

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152. Such a record as the above is called an account.

153. The person who owes a debt is a debtor (Dr.). The person to whom a debt is owed is a creditor (Cr.). A written statement of sums due on account rendered, by the creditor to the debtor, is a bill. (See examples 81, 82 and 83.)

Who is debtor in the account above? Who is creditor? Which of the items are charges for work done? Which are charges for ma terial furnished ?

154. When the bill is paid, the creditor, or some one authorized by him, signs the bill, after the words “Received payment" or "Paid." The bill is thus receipted. (See

examples 82 and 83.)

Examples for Written Work.

155. Find the cost of each article in the following bills, and their several amounts :

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