Marina has $24,500 to invest. She divided the money into three different accounts. At the end of the year, she had made $1300 in interest. The annual yield on each of the three accounts was 4%. 5.5%, and 6%. If the amount of money in the 4% account was four times the amount of money in the 5.5% account, how much had she placed in each account? Dont solve the equation. Find out what the variables are and the system if equations.