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prealgebra senior

Problem

LeRoy and Bernardo went on a week-long trip together and agreed to share the costs equally. Over the week, each of them paid for various joint expenses such as gasoline and car rental. At the end of the trip it turned out that LeRoy had paid A dollars and Bernardo had paid B dollars, where How many dollars must LeRoy give to Bernardo so that they share the costs equally?
(A)
(B)
(C)
(D)
Solution
The total amount of money that was spent during the trip was So each person should pay if they were to share the costs equally. Because LeRoy has already paid dollars of his part, he still has to pay
Final answer
C