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Omni-MATH / In the 5×5 grid shown, 15 cells contain X's and 10 cells are empty. What is the smallest number of X's that must be moved so that each row and each column contains exactly three X'…

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problem

In the 5×55 \times 5 grid shown, 15 cells contain X's and 10 cells are empty. What is the smallest number of X's that must be moved so that each row and each column contains exactly three X's?
Plain-text mathematical notation (without MathML)
In the 5×5 grid shown, 15 cells contain X's and 10 cells are empty. What is the smallest number of X's that must be moved so that each row and each column contains exactly three X's?
Original LaTeX notation
In the $5 \times 5$ grid shown, 15 cells contain X's and 10 cells are empty. What is the smallest number of X's that must be moved so that each row and each column contains exactly three X's?

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