The following exercise involves the information in the figure shown below on painting a room.

Task Length Dependencies

a$.$ Select paint color $3$ days

b$.$ Calculate square footage of area to be painted $45$ minutes

c$.$ Buy paint $1$ hour a$,$ b

d$.$ Buy drop cloths, brushes, rollers, TSP$,$ tape $1$ hour

e$.$ Wash walls with TSP $4$ hours d

f$.$ Remove lights, plug covers and switch covers $30$ minutes

g$.$ Tape walls and windows alongside trim $1$ hour d

h$.$ Paint trim $3$ hours c$,$ d$,$ e$,$ g

i$.$ Let trim paint dry $3$ hours h

j$.$ Remove wall tape $30$ minutes i

k$.$ Tape trim alongside walls $1$ hour d$,$ i

l$.$ Paint walls $3$ hours c$,$ d$,$ e$,$ f$,$ g$,$ h$,$ k

m$.$ Let wall paint dry $3$ hours l

n$.$ Remove trim tape and window tape $30$ minutes m

o$.$ Replace lights, plug covers and switch covers $30$ minutes m

p$.$ Clean brushes, rollers $30$ minutes l

q$.$ Dispose of drop cloths, tape $15$ minutes n

How many workers would it take to finish the painting job within the completion time?