Lennox owns a big apple orchard. She ships her apples to various markets using a fleet of trucks. Every week, each truck goes on 3 trips, and for each trip Lennox gets 300 dollars. On a single trip, a truck delivers 50 packs, and each pack contains 12 kilograms of apples. Overall, Lennox sells 4500 dollars worth of apples in a week. How many trucks are in Lennox's fleet?

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Calculate income per trip:  Calculate the total income per trip for one truck. Reasoning: Each trip earns 300 dollars. Calculation: 300 dollars per trip.Determine total trips per week:  Determine the total number of trips made by all trucks in a week. Reasoning: Each truck makes 3 trips per week. Calculation: Let's denote the number of trucks as $ x $. Total trips = $ 3x $.Calculate total weekly income:  Calculate the total weekly income from all trips. Reasoning: Total income is the product of the number of trips and income per trip. Calculation: Total income = $ 3x \times 300 $ = $ 900x $ dollars.Set up equation for trucks:  Set up the equation to find the number of trucks based on total weekly income. Reasoning: We know the total weekly income from selling apples is 4500 dollars. Calculation: $ 900x = 4500 $.Solve for number of trucks:  Solve for $ x $, the number of trucks. Reasoning: Divide both sides of the equation by 900 to isolate $ x $. Calculation: $ x = 4500 / 900 $.Final calculation error check:  Final calculation error check. Reasoning: Check if $ x = 5 $ satisfies the conditions given in the problem. Calculation: $ 900 \times 5 = 4500 $ dollars, which matches the problem statement.

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