What is the 3rd arithmetic mean out of 4 arithmetic means inserted between 18 and 3? - IQ786

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What is the 3rd arithmetic mean out of 4 arithmetic means inserted between 18 and 3?

What is the 3rd arithmetic mean out of 4 arithmetic means inserted between 18 and 3?

6

9

12

15

Explanation

The common difference is $-3$ , so the sequence becomes:
$18, 15, 12, 9, 6, 3$
The 3rd mean is the 4th term: 9.