47. $8750 was invested at 12%, and $6250 was invested at 4%.
49. 10.5 ft by 6 ft
51. 15 and 8
53. The original width is 40 m, and the original length is 160 m.
(7500, 150,000)
11,129 timers
57. $450 for the single and $600 for the double
59. 3
61. Janet is 34, and Steve is 51.
63. They stole $35,000, and $15,000 went to Butch, $12,000 went to Sundance, and $8000 went to Billy.
65.
67. She should build 4 two-story houses and 14 one-story houses to obtain a maximum profit of $96,000.
69. large: $60; medium: $52; small: $45