What is three-sevenths of a certain length if one-seventh is equal to 25 m?

1/7 of the magnitude is 25 meters. In order to find how many meters will be 3/7 of this value, you need to take 1/7 three times, that is, take 25 meters 3 times. The resulting value is 25m + 25m + 25m = 3 * 25m = 75 meters.
Answer: three-sevenths of the length is 75 meters.

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