[A,B" and "C" can do a piece of work in "20,30" and "60" days "],[" respectively.In how many days can "A" do the work if he is "],[" assisted by "B" and "C" on every third day? "]

A, B and C can do a piece of work in 20, 40 and 80 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

If A, B, and C can do a piece of work in 15, 30, and 60 days respectively. In how many days together they will do the same work?

A,B and C can do a piece of work in 11 days,20 days and 55 days respectively,working alone.How soon can the work be done if A is assisted by B and C on alternate days?

A, B and C can do piece ofwork in 30 days, 45 days and 90 days, respectively. A starts the work and heis assisted by B and C togetheron every third day. In how many dayswill the work be completed?