Question 126199
.05x+.03(18000-x)=660
.05x+540-.03x=660
.02x=660-540
.02x=120
x=120/.02
x=6000 amount invested @ 5%.
18000-6000=12000 invested @ 3%.
proof:
.05*6000+.03*12000=660
300+360=660
660=660