Construct a gantt chart and project network

Question

Question: Construct a Gantt chart and project network for the following set of activities, compute the length of each path in the network, and indicate the critical path:

Activity                                   Activity Predecessor                                       Time (months)

            1                                            ___                                                                    4

            2                                            ___                                                                    7

            3                                              1                                                                      8

            4                                              1                                                                      3

            5                                              2                                                                      9

            6                                              3                                                                      5

            7                                              3                                                                      2

            8                                              4,5,6                                                                6

            9                                              2                                                                      5