How old is Jim's brother

Logic Level 1

When Jim was 4 yrs old his brother was half his age. Now Jim is 18 how old is his brother.


The answer is 16.

Latifa Choudhury by Latifa Choudhury , 17, Australia

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2 solutions

When Jim was 4 years old, his brother was 2 years old. The difference between their ages is 2 years and it will always be 2 years (disregarding the exact birthdates). Now that Jim is 18, his brother must be 16 \boxed{16} .

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Latifa Choudhury
Dec 8, 2017

This is because when Jim is 4 yr old his brother would be half his age that will be 2, which means Jim's brother is 2 years younger than Jim. So when Jim is 18 his brother would be 16.

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