Rule 7:
If A can do a piece of work in D1 days, B can do in D2 days and C can do in D3 days then they together can do the same work in
Example
If A can do a piece of work in 30 days, B can do in 24 days and C can do in 20 days then they together can do the same work in _____ days.
Sol:
Rule 8:
If A and B together can do a piece of work in D1 days and A alone can do it in D2 days, then B alone can do the work in
Example
Jack and Jill together can do a piece of work in 10 days. Jack alone can do it in 15 days. In how many days can Jill alone do it?
Sol:
Let’s say D1 = 10, D2 = 15
Rule 9:
If the number of men are changed in the ratio of m:n, then the time taken to complete the work will change in the ratio n:m
