Memory problem!

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Been totally off plan since my hols ( last week in June), eating really badly, and not exercising. Anyway, aiming to restart, so back to gym this lunchtime for a lovely swim and I weighed myself.
Trouble is, now I'm back at work, I cant remember if it was 115.7 kg or 117.5 kg! one would mean I'd put on 1lb, and been very lucky, the other is sadly more likely with a 5lb gain in the three weeks.....

Its one of those "senior" moments......