Question

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The City Commission of Nashville has decided to build a botanical garden and picnic area in the heart of the city for the recreation of its citizens. The precedence table for all the activities required to construct this area successfully is as​ follows:

                                                                               

Code	Description	Time ​(hrs)	Immediate​ Predecessor(s)
A	Find​ location; determine resource requirements	20	None
B	Requisition of lumber and sand	60	A
C	Dig and grade	100	A
D	Saw lumber into appropriate sizes	30	B
E	Position lumber in correct locations	20	​D, C
F	Nail lumber together	10	E
G	Put sand in and under the equipment	20	F
H	Put dirt around the equipment	10	F
I	Put grass all over the​ garden, landscape, paint	30	​G, H

Refer to the legend

LOADING...

for the activity that corresponds to each code.

Using the line drawing​ tool, draw a Gantt chart for activites E through I of the project.

020406080100120140160180200IHGFEDCBA

Answer 1

Answer:

Critical path: A,C,E,F,G,I

Duration: 185 hours

Explanation;

Network Activity on Nodo (AON)

Steps

Forward calculations

Start Node: ES=EF=0

Initial node. ES = 0; EF=ES+t

In the other nodes:

1) Earliest start time (ES) = max (EF of predecessors)

2) EF=ES+t

Backward calculations

End node: LF=EF; LS=LF- t

In the other nodes:

1) Last completion time (LF) = min (LS of successors)

2)LS=LF- t

Slack = LS - ES or LF - EF

Critical path: activities without slack

A,C,E,F,G,I

Duration: 185 hours