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The average weight of a blue whale is 4 x 10^5 pounds, and the average weight of an elephant is 1 x 10^4 pounds. To find out how many times heavier a blue whale is than an elephant, we can divide the weight of the blue whale by the weight of the elephant.
4 x 10^5 / 1 x 10^4 = 40
Therefore, a blue whale is approximately 40 times heavier than an elephant in pounds. So the correct answer is 40 times heavier.