Define relative dating of fossils
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By measuring the ratio of the amount of the original radioactive element to the daughter isotope, scientists can determine how many half-lives the element has undergone and from there can figure out the absolute age of the sample.
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In other words, half (50%) of the Carbon-14 you started with has decayed into the daughter isotope Nitrogen-14.
However, your readout from your radioactivity measuring instrument says you have only 25% Carbon-14 and 75% Nitrogen-14, so your fossil must have been through more than one half-life.
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After two half-lives, another half of your leftover Carbon-14 would have decayed into Nitrogen-14.