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From the given information, we see that the building and its shadow form a right triangle with base 30 ft and height 55 ft.

Also, the person and his/her shadow form another similar triangle with base 3 ft and height x ft.

Since both triangles are similar, we have:

x/55 = 3/30 or
x/55 = 1/10 cross multiply
10x = 55 divide by 10 to both sides
x = 5.5

Thus the person is 5.5 inches tall.

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