can sombosy explain how to get to this answer

The expected return on security A is 9% and the volatility of this return is 50%. The expected return of security B is 14% and the volatility of this return is 40%. The correlation coefficient between the returns of security A and B is 0.25 . The risk free rate is 3%. The weight of security A in the tangency portfolio of security A and B is closest to fide question 4 feedback The weights of the tangency portfolio is the standardized solution of 0.25xz3+0.06xzb=0.060.06xza+0.16xzb=0.11 The standardized solution is 14.3% for security a and 85.7% for security B