One of my two brothers is $$4$$ years older than the other. If the sum of their ages is $$38$$, the older brother isyears old. 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Problems Involving Sum and Difference
One of my two brothers is $$4$$ years older than the other. If they were the same age, they\textquotesingle d each be $$19$$. Thus, one is $$17$$ and the other is $$21$$. 