An x number of people can do the work in 45 days. After working for 15 days, 10 more people join the work. Then the left-out work is completed by the all people in 20 days. If 75% of the x number of people works initially, find the total work completed by the 75% of x in how many days.
1
55 days
2
50 days
3
60 days
4
45 days
5
40 days