When I was 4 years old, my brother was half my age. Now, I'm 18. How old is my brother ? The setup of the question suggest his brother was half his age when he was for..but his age is then mentiond and he is 18 now witch Means that The brother must have been 9 at The time and The eqation is 3*9÷4=23 his brother is an older brother!
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when your 4 your brother 2
when your 18 your brother 9
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