If I'm 4 times older than Billy currently, and Billy is 4 years old, how old was I when Billy was born? Give me reasons, before answering the question
I would currently be 4 * 4 = 16 years old, since I'm 4 times older than Billy's age of 4. Therefore, in order to find my age at Billy's birth we'd simply subtract Billy's age of 4 from my age, meaning I was 16 - 4 = 12 years old. So the final answer is 12.