Concept:The brother’s age is expressed as an algebraic statement based on Halima’s age.It is “5 years more than half of her age.”Explanation:Halima’s age is n years.Half of Halima’s age is 2n.Her brother is 5 years older than half of her age.Therefore, his age is 2n+5.This matches option D exactly.Answer:The brother is 2n+5 years old.So the correct choice is D.