It should be obvious to anybody that the answer will depend on the units used for 24.5, which are unspecified. For example, 24.5 feet to the nearest inch will be quite different to 24.5 centimetres!
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1 inch
0.995 inches rounded to the nearest tenth of an inch is 1.0 inch.
If that's already cubic inches, it is already rounded to the nearest cubic inch. If it isn't, it won't round to them.
63 inches
1.0"