Amy completes a work in t day and with Bob. Amy takes n day for the same work. If Bobo can completes twice the same work inside of 16 day, which of the following gives the correct relation between t and n ?

If 10 men can complete a work in 12 days . In how many days can 18 men complete the same work ?

In how many days can 4 women complete a work? I. 4 men and 4 women can complete the same work in 12 days. II. 10 women can complete the same work in 16 days

A and C together can complete a work in 120 days, C and E together can complete the same work in 80 days and A and E together can complete the same work in 160 days. In how many days A, C and E together can complete the same work?