Correction for the weight of a Grand Piano
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How heavy is 24 stones?
It's about one-third as heavy as a Grand Piano
The weight of a Grand Piano is about 71 stones.
(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 71 stones. Well-made pianos such as this may last 75 to 100 years.