Question 1094334
.72a+.8b=.75(a+b)
b=30
.72a+.8*30=.75(a+30)
.72a+.8*30=.75a+.75*30
.8*30-.75*30=.75a-.72a
.05*30=.03a
5*30=3a
50=a
check
.72*50+.80*30=.75(80)
.72*50+.80*30=60
60=60
ok