Than X one day’s work is =1/k

IF P is thrice as good a workman as Q then

Ratio of work done by P and Q= 3:1

Days* One day work= Total work done by person

One day work = Total work done by person/Days

45 person do complete work 16 days total work (45*16=720)

Six days after reaming work done by 30 men’s are joined with them(total mens are 75).

Now we are find reaming day’s single person work work

This is formula

75 men do work in single day=total no of man/(total work)=75/720

If your are not understand see this Question and answer for example