When I was four, my sister was half my age. Now I am 28, how old is my sister?
user
Your sister is 26 years old.
assistant
How did you work this out? My initial thought is that my sister is 14 years old.
user
The first part of your initial question states that when you were 4, your sister was half your age, meaning that she was 4 / 2 = 2 years old.
Now you are 28, meaning that 24 years have passed since you were 4.
This means that your sister is now 2 + 24 = 26 years old.
assistant