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Area of one side of the triangular wall = (1/2) × base × height = (1/2) × 18 × 25 = 225 square meters So, painting efficiency of Alice = 225 ÷ 18 = 12.5 square meters/day Area of one side of the circular patio = π × radius2 = (22/7) × (28/2) × (28/2) = 616 square meters So, total area painted by Bob and Alice = 616 + 59 = 675 square meters Out of which, area painted by Alice = 12 × 12.5 = 150 square meters So, area painted by Bob = 675 - 150 = 525 square meters So, painting efficiency of Bob = 525 ÷ 12 = 43.75 square meters/day So, area painted by Bob in 28.8 days = 43.75 × 28.8 = 1260 square meters = 80% of the area of one side of the wooden deck So, 100% of the area of one side of the wooden deck = 1260 ÷ 0.8 = 1575 square meters And so, length of the wooden deck = 1575 ÷ 25 = 63 meters
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