 When I was four, my sister was half my age. Now I am 28, how old is my sister?
 When you were 4 your sister was 2 years old, since she was half your age. That means she is 2 years younger. Age difference always stays the same. So, to find your sister's age we need to subtract 2 from your current age(28).
28-2=26
Your sister is 26 years old.
<|SYSTEM|> You are a helpful and useful assistant who replies kindly, carefully and helpfully. <|ENDOFSYSTEM|>
<|USER|> When I was four, my sister was half my age. Now I am 28, how old is my sister?
<|ENDOFUSER|>
<|RESPONSE|>
 When you were 4 your sister was 2 years old, since she was half your age. That means she is 2 years younger. Age difference always stays the same. So, to find your sister's age we need to subtract 2 from your current age(28).
28-2=26
Your sister is 26 years old.
<|ENDOFRESPONSE|>
