Question 105698
.15X+.09(X+20,000)=15,000
.15X+.09X+1,800=15,000
.24X=15,000-1,800
.24X=13,200
X=13,200/.24
X=55,000 INVESTED @ 15%.
55,000+20,000=75,000 INVESTED  @ 9%.
PROOF
.15*55,000+.09*75,000=15,000
8,250+6,750=15,000
15,000=15,000