Directions: Read the information carefully and answer the questions. A, B, C…

Directions: Read the information carefully and answer the questions. A, B, C and D together can do a work ‘X’ in seven days and D did ¼th of the work ‘X’. The ratio of efficiency of A to that of B is 3 : 4, while B is 100% more efficient than C. A and B together can complete work ‘X’ in ‘x’ days, while A and D can do the same work together in ‘y’ days.

Two persons P and Q together can complete another work ‘Y’ in (x+12) days, while Q and R together can complete the same work in (y − 2) days. If P, Q and R together can complete the work ‘Y’ in 6x/(y−7) days, then find by what percent the efficiency of ‘Q’ is more or less than the efficiency of ‘P’.