27. A farmer sold 75 bushels of wheat, at $2 per bushel, for which he received 15 yards of cloth, at $4 per yard, and the balance in money; how much money did he receive? 28. A man's income is $1687 a year, and his expenses are $4 a day; what does he save in a year of 365 days? 29. The earth, in going round the sun, moves 19 miles per second; how far does it move in an hour?

30. Light moves 192000 miles in a second; how far does it move in an hour?

31. I owe 3 notes, whose sum is $368. One of these notes is for $125, another for $84; for what is the third one? 32. A and B start from the same place, and travel in the same direction, A at the rate of 48 miles, and B 64 mile per day; how far apart are they in 1 day? In 24 days?

33. A and B start from the same place, and travel in opposite directions, A at the rate of 36 miles, and B 44 miles, per day; how far apart are they in 35 days?

34. The President of the United States receives a salary of $25000 a year; what will he save in a year of 365 days, if his expenses are $40 per day?

35. In 1 hogshead of wine there are 63 gallons; how many gallons in 36 hogsheads?

36. How many yards of cloth in 25 bales, each bale taining 54 pieces, and each piece 36 yards?

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37. The last transit of Venus across the sun's face was in 1769, and the next will be in 1874; how many years between these two transits ?

38. Bonaparte was born in the year 1769, and lived 52 years; in what year did he die?

39. The first settlement in New England was made at Plymouth in 1620; how many years is it since that time ? 40. How long since the Declaration of American Independence in 1776 ?

41. A rectangular piece of ground is 72 rods long and 36 rods wide; how many square rods are there in the piece? How many rods is it round the piece?

42. A piece of ground is 42 rods square; what will it cost to build a wall around it, at $2 per rod? What is the piece of ground worth, at $3 per square rod?