Solve this problem

Question

Jolene invests her savings in two bank     accounts, one paying 5 percent and the other paying 10 percet simple interest per year. She puts twice as much in the lower-yielding account because it is less risky. Her annual interest is 6900 dollars. How much did she invest at each rate?

Answer 1

.05(2x) + .10(x) = 6900

.20x = 6900

x = $34500 at 10%

2x = $6900 at 5%

.05 x $6900 = $3450 + .10 x $34500 = $3450 for total $6900 interest