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The [mean] average of 5 numbers is 25, so their total is 5 x 25 = 125

The [mean] average of 4 numbers is 25, so their total is 4 x 25 = 100

→ the excluded number is 125 - 100 = 25.

Alternatively, as the average doesn't change, the excluded number must be the average, ie 25.

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Q: The average of 5 numbers is 25 if one number is excluded the average becomes 25 the excluded number is?
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