In the year AD21, a man was 36 years old. In what year was he 12 years old?
We need to subtract 36 years from AD21 to determine the year when the man was 12 years old:
AD21 - 36 years = AD (21 - 36) = AD -15
Therefore, the man was 12 years old in the year AD -15 (or 15 BC).
To find the year when the man was 12 years old, we will use the given information that in the year AD21, he was 36 years old.
Step 1: Calculate the difference between the age at AD21 and the desired age of 12 years old.
36 years old - 12 years old = 24 years
Step 2: Subtract the age difference from the starting year of AD21.
AD21 - 24 years = AD-3 (or 3 BC)
Therefore, the man was 12 years old in the year AD-3, which is the same as 3 BC.