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To convert pounds to kilograms using scales designed with dual measuring units, aligning the pounds (lbs) on the outer scale with the kilograms (kg) on the inner scale is the most effective method. This technique enables users to read off the equivalent weight directly without calculations or conversions. The scales typically have a fixed ratio where both units are marked, facilitating an immediate understanding of how many kilograms correspond to a given number of pounds. This direct alignment provides accuracy and efficiency in weight conversion.

Measuring the weights of fuel or any other substance does not relate to converting units between pounds and kilograms and would not yield the necessary conversion. Using an average of both units is incorrect, as it does not yield a valid conversion factor but rather a misleading value. Simply adding pounds and kilograms together lacks mathematical validity and does not reflect any applicable conversion method.