29. A knot, or nautical mile, is used in measuring the speed of vessels. It is equal to about 1.15 common or statute miles. a. The Missouri's speed is how many common miles per hour?

b. The Maryland's speed per hour is how many common miles greater than the Missouri's?

30. a. A knot is 6080.27 ft. How many feet farther can the cruiser Maryland sail in an hour than the battleship Alabama?

b. If the Alabama is 9.9 knots ahead of the Louisiana, and both are moving at highest speed, in how many hours can the Louisiana overtake the Alabama?

31. How many common miles can the Kentucky go in 24 hours, if she goes 16.9 knots per hour all the time?

32. How many feet can the Rhode Island go in 1 minute? Make other problems about these warships, using the numbers given in the table.

33. What is the cost of 8.2 bales of cotton, each bale weighing 412.6 lb. at $} a pound?

34. Two motor cars start from the same place at the same time and go in opposite directions, one at the rate of 12.325 miles an hour, and the other at the rate of 14.875 miles an hour. How far apart are they at the end of 101 hours?

35. a. What must be paid for the use of $225 for one year at the rate of 6 cents a year for the use of one dollar? b. For two years? c. For 31 years?

36. Mr. Scott borrowed $1500 from Mr. Moore and agreed to pay it back in two years, and also to pay Mr. Moore for the use of it at the rate of 5 cents a year for every dollar. a. How much did Mr. Scott have to pay for the use of the money?

b. How much did he have to pay in all?

37. If I pay 42 dollars for the use of $600 for a year, how much do I pay for the use of one dollar?

38. Find how much I will pay in 21 years for the use of $2000 if I pay 41 cents each year for the use of every dollar.

39. Mr. Marvin borrowed $3500 and paid it five years afterward. He also paid 4 cents each year on every dollar he owed. How much did he pay in all?

40. If I pay at the rate of 7 cents a year for the use of one dollar, how much must I pay for the use of $2800 for six months? (Six months are what part of a year?)

41. a. If 5 cents will pay for the use of one dollar for a year, $24 will pay for the use of how many dollars for a year?

b. At the rate of 6 cents a year for the use of a dollar, $24 will pay for the use of how many dollars for a year?

42. These loaves of bread are 11 inches long. The blade of the bread cutter revolves so as to cut off a slice of bread at turn of the

every wheel.

a. If the slices are 16 in. thick, how many inches of the loaf will be cut off by 18 turns of the wheel?

b. How many inches will be left?

c. How many turns are made in cutting an entire loaf?

d. How many slices are made from one loaf?

43. A loaf of this bread is made into sandwiches. The slices are in. thick. The crusts are not used for this purpose. Each sandwich is made of two slices of bread and one ounce of meat that costs 16 a pound. The bread costs 5¢ a loaf. a. How many sandwiches are made?

b. What is their entire cost?

c. If they are sold at 5 apiece, what is the profit on all of them?

44. There are 90 loaves of bread in the picture.

a. If they are 11 in. long and cut into slices in. thick, how many slices are there?

b. If the bread costs 5 a loaf and all except the crusts is served at a lunch counter at 1 a slice, what is the profit on all of it?

c. The 90 loaves would make how many slices in. thick?

45. A barrel of flour weighs 196 lb. Flour costing $5 a barrel is made into bread containing 11 oz. of flour to a loaf. Some of the bread is bought by Mrs. X at 5¢ a loaf.

a. How many loaves of bread are made from a barrel of flour?

b. How much does it bring at 5¢ a loaf ?

c. How much would Mrs. X save by buying a barrel of flour and making her bread, supposing that the yeast costs 50 and the extra coal 80¢?

MULTIPLYING AND DIVIDING BY TWENTY-FIVE

158. 25 = 100 ÷ 4. Therefore we may multiply a number by 25 by multiplying it by 100 and dividing the product by 4, thus: 36 × 25 = 3600 ÷ 4 = 900.

How did we multiply 36 by 100 ?

2. Find the cost of:

a. 97 stoves at $25 apiece.

b. 25 yd. of silk at $1.39 a yard.

c. 130 acres of land at $25 an acre.

d. A 12-pound turkey at 25 cents a pound.

160. To divide a number by 25 we may point off two decimal places in the number and multiply the result by 4, thus:

162. When your mother sends you to the store where she is accustomed to buy groceries, giving you no money to take with you, and tells you to buy certain articles and have them charged, what does she mean?

The merchant has a book in which he keeps the names of persons to whom he sells things not paid for at the time of the sale, together with a list of the articles sold, their value, and the date of sale. This list is called an account.