Investment problem

Question

Jolene invests her savings in two bank accounts, one paying 5 percent and the other paying 10 percent simple interest per year. She puts twice as much in the lower-yielding account because it is less risky. Her annual interest is 6000 dollars. How much did she invest at each rate?

Answer 1

0.05(2x) + 0.10x = 6000

Solve for x and answer.