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Construct a Gantt chart similar to the one in Figure $6\mathrm{.}10$ using the following data: When will task G be completed?

$\backslash$table$[[$Task$,$Start Time $($wks$),$Duration $($wks$)],[$A$,0,5],[$B$,6,3],[$C$,7,4],[$D$,7,9],[$E$,8,2],[$F$,9,8],[$G$,12,7]]$

How must the Gantt chart you drew in problem $24$ be changed if you were told that $C$ and D could not begin until B was completed and that G could not begin until C was completed? What happens to the project completion time?