Easy equation

Elvish : Mom I can't get this math Olympiad homework problem Mom .Let me try .5 brothers each born in a different year, share a gift of $100 according  to the following arrangement : Each boy,except the youngest gets $5  more than his next younger brother. How much does the youngest boy get? Now think about it .. Elvish: I did ...I think the dad was kinda unfair .He had the right number of kids he could have divided the money evenly .. just saying. An easier math problem to solve