Question 490171
let a=5%
    b=6%

eq1 a+b=15000
    b=15000-a
eq2 .05a+.06(15000-a)=860

perform the indicated operations in the equation:
.05a+.06(15000-a)=860
.05a+900-.06a=860
.05a-.06a=860-900
.01a/.01a=40/.01
a=4000

b=15000-4000=11000
therefore he invested 11000 at 6% and 4000 at 5%...