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Answer:
36 inches
Explanation:
Based on comments elsewhere, we assume the ideal ratio is 1/3 inch of tail length for each 1/2 inch of hind leg length.
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The applicable proportion is ...
hind leg/tail = x / (24 in) = (1/2 in) / (1/3 in)
x = (24 in)(3/2) = 36 in
The ideal hind leg length for a 24-inch tail is 36 inches.