Question

when I was 4 years old my sister was my half now I am 100 years old how old my sister

Answer 1

Your sister would be 98, because when you were 4, she was half your age, that means she was two years younger.

Answer 2

your sister is currently 98 years old because when you was 4 years old your sister was half of the age that is 4-2=2. 100-2=98 years