27. 80 acres of corn and 160 acres of soybeans to obtain a maximum profit of $10,400

29. 40 hours for machine I and 20 hours for machine II to obtain a minimum cost of $3600

31. Five minutes of television and two pages of newspaper advertisement to obtain a maximum of 340,000 viewers

33. The maximum profit is $14,600.

35. 400 of both the rectangular and circular tables should be made to have a maximum profit of $2800.

37. The contractor should build 33 terraced houses and 66 cottages to obtain a maximum amount of money: $4,290,000.

39. Mrs. Adams’s maximum profit is $1355 when she has 175 male guests and 125 female guests.

41. Elisa should buy ten enchilada meals and five vegetable loaves to obtain a minimum cost of $46.25.