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It is known that the average value of two numbers is 320, one of which is 56, and what is the other?
There are two known conditions: (1) the average of two known numbers is 320, and (2) one of them is 56.

Question: What is the other number?

According to the first known condition, the sum of these two numbers can be calculated: 320×2=640.

According to the second known condition, another addend can be calculated: 640-56=584.

The other addend is 584.

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