Question

A girl born in 1950 and died in1950 but she was of 20 years old

Answer 1

A girl born in 1950 and died in 1950 but she was of 20 years old because she was born in room number 1950 of a hospital and she died in room number 1950. 1950 can be a room number for hospital or her home address where she was born or died.

Therefore, her age is not related to room number which seems to look like a year in the given question. Such types of tricky questions are asked in UPSC examination and to solve such question we need presence of mind.