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Question V: Kevin builds two kinds of birdhouses, one for wrens and a second for bluebirds. Each wren birdhouse takes 4 hours of labor and 2 units of lumber. Each bluebird house requires 4 hours of labor and 12 units of lumber. The craftsman has available 60 hours of labor and 120 units of lumber. Wren houses yield a profit of S6 each and bluebird houses yield a profit of $15 each. The linear programming formulation is: Let Xw = number of birdhouses for wrens, and xs - number of birdhouses for bluebirds. Maximize 6xw +15x8 Subject to: 4xw +4x3 360 2x + 12x3