That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.
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2
25 feet tall
5.5/8 = x/20 x=5.5*20/8 = 13.75 feet
6 feet
50 feet