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The average of the first 10 multiples of 3 is:

  • A.15
  • B.16.5
  • C.18
  • D.19.5

Answer: B

The first ten multiples of 3 run from 3 to 30 in equal steps, so the average is the average of the extremes.

\[ \frac{3 + 30}{2} = 16.5 \]

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