Risk and Rates of return, Can you show me the working out of this problem. I know you have to find the weight of each stock but i do not understand how to solve for it with the information given

You would like to invest $19,000 and have a portfolio expected return of 12.3 percent. You are considering two securities, A and B. Stock A has an expected return of 15.6 percent and B has an expected return of 10.3 percent. How much should you invest in Stock A if you invest the balance in Stock B?