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2014-08-13T07:44:07+05:30
2014-08-13T23:53:49+05:30

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While measuring the length with 20m tape, we made 500 m / 20 m = 25 spans of measurements.  I mean we used the full lenght of tape 25 times to completely measure the true length.

Now let the actual or correct length of tape be X meters
25 * X = 502 meters          => X = 502/25 = 20.08 m

Answer is B

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