To find out how long Mrs. Ahmed lived, you need to subtract the year she was born from the year she died. The formula is:
(where L is the length of life, D is the year of death, and B is the year of birth)
We are given that Mrs. Ahmed was born in 1898 and died in 1971. Plugging these values into the formula, we get:
Therefore, Mrs. Ahmed lived for 73 years.