20 20+10=30 30-5=25 25+10=35 35-5=30 30+10=40 40-5=35 20,30,25,35,30,40,35,45,40,50,45,55,50,60,55,65,60,70,65,75,... The general term isIf you want me to show you how I got that general term, ask me in the space below, and I'll get back to you by email. Edwin