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Luigi and Yang hold a 4 hour sale at the beginning of the following month. Using the 'Sale Day' resource and the following clues, calculate the four missing values.
In Luigi's third hour, he sold as much as his first hour plus second hour.
In Yang's second hour, he sold as much as Luigi's first hour plus fourth hour.
Finally, use a number line to show the difference between Luigi and Yang's totals from the sale.