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Omni-MATH / The numbers 5,6,10,17, and 21 are rearranged so that the sum of the first three numbers is equal to the sum of the last three numbers. Which number is in the middle of this rearran…

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problem

The numbers 5,6,10,175,6,10,17, and 21 are rearranged so that the sum of the first three numbers is equal to the sum of the last three numbers. Which number is in the middle of this rearrangement?
Plain-text mathematical notation (without MathML)
The numbers 5,6,10,17, and 21 are rearranged so that the sum of the first three numbers is equal to the sum of the last three numbers. Which number is in the middle of this rearrangement?
Original LaTeX notation
The numbers $5,6,10,17$, and 21 are rearranged so that the sum of the first three numbers is equal to the sum of the last three numbers. Which number is in the middle of this rearrangement?

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