15. What is the cost of 8.2 bales of cotton, each bale weighing 412.6 lb., at $.28 a pound? 16. Two motor cars start from the same place at the same time and go in opposite directions, one at the rate of 15.4 miles an hour, and the other at the rate of 19.8 miles an hour. How far apart are they at the end of 10 hours? 17. (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 3 years? 18. Mr. Scott borrowed $1500 from Mr. Moore and agreed to pay it back in two years, and also to pay 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? 19. Solve in the easiest way: a. If 6 acres of land cost $438, what will 42 acres cost? b. How many loads of earth can be bought for $80 when $400 will buy 1135 loads? 20. Find how much I will pay in 2 years for the use of $2000 if I pay 4 cents each year for the use of every dollar. 21. Mr. Marvin borrowed $3500 and paid it five years afterward. He also paid 4 cents interest each year on every dollar he owed. How much did he pay in all? 22. 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?) 23. is how many times? 24. Divide of of × 31 by ğ of 1 of Find: 25. The number of square inches in a map 3 ft. by 41 ft. 26. The number of barrels of water in a tank containing 378 gallons. 27. The volume of a dry goods box that is 3 ft. by 21 ft. by 24 inches. 28. The number of square yards of crash required to cover a floor that is 144 ft. long and 87 ft. wide. 33. Express in figures: One thousand one, and one hundred one thousandths. 34. Express in figures: Ten, and ten ten-thousandths. 35. Express in figures: One hundred, and one hundred ten thousandths. Tell how to solve problems 36 and 37; then supply numbers and solve them. 36. When telephone poles are set many poles are there to a mile? rods apart, how 37. Alice's account for the month shows that she has 38. When you know the cost of 7 articles, how may you find most easily the cost of 21 of the same kind of articles? 39. When you know the quantity that $48 will buy, how may you find most easily the quantity that $6 will buy? |