19. $1490

21. 87

23. Length: 25 ft; width: 15 ft

25. 14 yr

27. $2010

29. 1500 cameras

31. $62,000 and $85,000

33. July: 530 tickets; August: 583 tickets

35. Younger son: $45,000; older son: $180,000

37.

1. 81

2. 78

39. $4000 in a tax shelter and $3000 in a bank

41. $2500

43. 35,000 shaving sets

45. 2.5 hr

47. 30 mph

49. 100 mph and 107 mph

51. 2 hr and 24 min

53. 3 hr and 36 min

55. 12 hr

57. 1.5 hr

59. 30 g

61. 450 g of 60-40 solder and 150 g of 40-60 solder

63. 2.25 liters

65. 231 nickels, 77 dimes, 308 quarters

67. 71 yr

69. 4 m