Answer: she was 83.5 feet below sea level, before ascending 61.9 feet to 21.6 feet below sea level.
Explanation:
You can add the distance she travelled upwards to her new distance to get her old distance.
Essentially, 21.6 + 61.9 = 83.5.
This means she was 83.5 feet below sea level, before ascending 61.9 feet to 21.6 feet below sea level.
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