The average of 13 numbers is 75. If the average of the first six numbers is 69 and the average of the last six numbers is 80, what is the 7th number?

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**Steps:**

1. Total of 13 numbers: $13	imes75=975$.
2. Sum of first six: $6	imes69=414$. Sum of last six: $6	imes80=480$.
3. Seventh number = $975-414-480=81$.
4. So the 7th number is **81**.

FINAL_ANSWER: a

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