Mixture A contains milk and water in the ratio 7:8 respectively, and Mixture of B contains milk and water in the ratio 5:4, respectively. If P litres of mixture A and Q litres of mixture B was taken out in an empty container X and then R% of that mixture from container X was taken out and was replaced with same quantity of juice, then the ratio of milk, water and juice in the container becomes 2:2:1.

Roots of the equation, x² - 90x - 9000 = 0 are (2P) and -(Q + 15) respectively. [ where P > Q ]