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The total of the 6 numbers is 48 (6x8) Adding another number will take the total to 7. So with an average of 10, the total of the 7 numbers will be 70 (7x10) 70 - 48 = 22 which is our seventh number.

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Q: The average of 6 numbers is 8 A seventh number is added and the new average is 10 What number was added?
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