320/(b*8-40)=10
(n/4-35)*6=150

320/(b*8-40)=108b-40=320/108b-40=328b=32+408b=72b=72/8b=9(n/4-35)*6=150n/4-35=150/6n/4-35=25n/4=25+35n/4=60n=60*4n=240