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.

‘m’ men can do a work in ‘n’ days and ‘n’ women can do the same work in ‘2m’ days. ‘x’ men and ‘1.5y’ women together can complete the same work in 20 days. 5 men and (y+1) women started working together and they did work only for D days and remaining work is completed by a woman in (25/3)D days. Find the value of ‘D’.