4. For the six-activity house shown below, each task in the network shows the manhours needed, the number of crew members, and the end buffer times in days. If you are to construct these tasks for six houses in 27 days, calculate the number of crews to be involved in each task and draw the schedule. Assume eight work hours per day.

A 64 Mhrs 2 Men Buffer = 1 day B 72 Mhrs 3 Men Buffer = 1 day C 48 Mhrs 3 Men Buffer 1 day D 64 Mhrs 2 Men Buffer = 0 days E 48 Mhrs 2 Men Buffer = 2 day F 72 Mhrs 3 Men