Question 933761
Let x = the amount invested at 6%
   2x = the amount invested at 7%

.06x+.07(2x)=660
   .06x+.14x=660
        .20x=660
           x=3300

Substitute x with 3300
2(3300)=6600

$3300 is invested at 6% while $6600 is invested at 7%.